* Re: alias appears to not work inside a called bash script
@ 2017-08-22 19:47 Kaz Kylheku
2017-08-25 2:23 ` L A Walsh
0 siblings, 1 reply; 14+ messages in thread
From: Kaz Kylheku @ 2017-08-22 19:47 UTC (permalink / raw)
To: cygwin
On 21.08.2017 15:53, Eliot Moss wrote:
> From the bash man page:
>
> "Aliases are ot expanded when the shell is not interactive, unless
> the expand_aliases shell option
> is set using shopt (see the description of shopt under SHELL BUILTIN
> COMMANDS below)."
>
> Could that be the root of your difficulty?
There is an issue there (though not for the Cygwin project).
I don't see where this behavior is required in POSIX: that is,
expanding aliases in interactive mode, but ignoring them in
non-interactive
operation.
POSIX seems to unequivocally be calling for Alias Expansion to occur
under all conditions.
And, indeed, this is not a bug in Bash; they know that this is
a POSIX deviation. Because, voila, aliases *are* expanded in
script mode if we do one of two things:
#!/bin/bash --posix
#!/bin/sh
Bash in POSIX mode knows every well that it had better
expand aliases regardless of non-interactive operation.
However, *suppressing* a useful behavior in a default, non-standard
mode is highly counter-intuitive.
I mean we can't even call this a vendor *extension* with a straight
face. What do we call this? "retraction?" :)
"To disable the vendor-specific retraction that aliases don't
work, operate bash in POSIX mode, or use the expand_aliases
shopt."
:)
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^ permalink raw reply [flat|nested] 14+ messages in thread* Re: alias appears to not work inside a called bash script
2017-08-22 19:47 alias appears to not work inside a called bash script Kaz Kylheku
@ 2017-08-25 2:23 ` L A Walsh
0 siblings, 0 replies; 14+ messages in thread
From: L A Walsh @ 2017-08-25 2:23 UTC (permalink / raw)
To: cygwin
Kaz Kylheku wrote:
>
> There is an issue there (though not for the Cygwin project).
>
> I don't see where ...
> "expanding aliases in interactive mode, but ignoring them in
> non-interactive
> operation" [is required by POSIX].
>
> POSIX seems to unequivocally be calling for Alias Expansion to occur
> under all conditions.
Could you list the http reference for that?
>
> And, indeed, this is not a bug in Bash; they know that this is
> a POSIX deviation. Because, voila, aliases *are* expanded in
> script mode if we do one of two things:
>
> #!/bin/bash --posix
>
> #!/bin/sh
----
Only in cygwin (4.4.12).
In my linux version of bash, expand_aliases is not turned on
in POSIX mode. Created scripts:
#!/bin/sh
shopt -s |grep expand
and
#!/bin/bash --posix
shopt -s |grep expand
On cygwin they show:
expand_aliases on
Not so on linux (same version of bash 4.4.12)
Hmmm...
Is there a definitive reference for this feature?
Thanks!
-l
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^ permalink raw reply [flat|nested] 14+ messages in thread
* alias appears to not work inside a called bash script
@ 2017-08-21 22:30 Michel LaBarre
2017-08-21 22:53 ` Eliot Moss
2017-08-22 14:31 ` Stephen John Smoogen
0 siblings, 2 replies; 14+ messages in thread
From: Michel LaBarre @ 2017-08-21 22:30 UTC (permalink / raw)
To: cygwin
[-- Attachment #1: Type: text/plain, Size: 1146 bytes --]
Hello all,
I have a 4 line bash script:
#!/bin/bash
alias nawk=gawk
alias nawk
nawk 'BEGIN {FS="^"} ; (length($0) > maxline) { maxline = length($0) ;
line=$0} ; END{print maxline, line}' $*
When I run the script I see:
alias nawk='gawk'
/cygdrive/c/mybin/maxline/: line 4: nawk: command not found
It looks like the alias is properly defined but it does not appear to take
effect.
Same thing happens if I alias to awk instead of qawk.
Same thing happens if I define the alias in .bashrc (I include an echo in
bashrc to confirm that it is being invoked).
My .bashrc is not likely a factor - I empty it and the result is the same.
No carriage returns in the script or .bashrc.
I have updated everything August 5th using setup and letting all "Pending"
pkgs update so I believe I am up to date.
The funny thing is that it works ok from an interactive session, whether the
alias is explicitly defined in the session or in .bashrc.
Thank you in advance for any insights.
BTW - I just re-subscribed to cygwin 4-5 hours ago and have not seen any
mail which seems unusual based on past experience.
Michel LaBarre
613-692-0507
[-- Attachment #2: cygcheck.out --]
[-- Type: application/octet-stream, Size: 37230 bytes --]
Cygwin Configuration Diagnostics
Current System Time: Mon Aug 21 18:22:17 2017
Windows 10 Home Ver 10.0 Build 15063
Path: C:\cygwin64\bin
.
C:\Program Files (x86)\Intel\iCLS Client
C:\Program Files\Intel\iCLS Client
C:\WINDOWS\system32
C:\WINDOWS
C:\WINDOWS\System32\Wbem
C:\WINDOWS\System32\WindowsPowerShell\v1.0
C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL
C:\Program Files\Intel\Intel(R) Management Engine Components\DAL
C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT
C:\Program Files\Intel\Intel(R) Management Engine Components\IPT
C:\mybinlocal
C:\mybin
C:\cygwin64\bin
C:\Program Files\Intel\WiFi\bin
C:\Program Files\Common Files\Intel\WirelessCommon
C:\Users\michel\AppData\Local\Microsoft\WindowsApps
Output from C:\cygwin64\bin\id.exe
UID: 197609(michel) GID: 197121(None)
197121(None) 545(Users)
4(INTERACTIVE) 66049(CONSOLE LOGON)
11(Authenticated Users) 15(This Organization)
113(Local account) 66048(LOCAL)
262154(NTLM Authentication) 4294967295(Unknown+Group)
401408(Medium Mandatory Level)
SysDir: C:\WINDOWS\system32
WinDir: C:\WINDOWS
PWD = '/cygdrive/c/mybin'
HOME = '/cygdrive/d/michel'
CYGWIN = 'glob:ignorecase'
USERDOMAIN = 'SPIRO1'
OS = 'Windows_NT'
COMMONPROGRAMFILES = 'C:\Program Files\Common Files'
PROCESSOR_LEVEL = '6'
PSModulePath = 'C:\Program Files\WindowsPowerShell\Modules;C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules'
CommonProgramW6432 = 'C:\Program Files\Common Files'
!ExitCode = '0000007F'
CommonProgramFiles(x86) = 'C:\Program Files (x86)\Common Files'
PUBLIC = 'C:\Users\Public'
USERNAME = 'michel'
LOGONSERVER = '\\SPIRO1'
PROCESSOR_ARCHITECTURE = 'AMD64'
LOCALAPPDATA = 'C:\Users\michel\AppData\Local'
!D: = 'd:\michel'
COMPUTERNAME = 'SPIRO1'
TTYIn = '/dev/cons0'
SYSTEMDRIVE = 'C:'
USERPROFILE = 'C:\Users\michel'
PATHEXT = '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.SH'
SYSTEMROOT = 'C:\WINDOWS'
USERDOMAIN_ROAMINGPROFILE = 'SPIRO1'
PROCESSOR_IDENTIFIER = 'Intel64 Family 6 Model 78 Stepping 3, GenuineIntel'
DEVNULL = '/dev/null'
TMP = '/cygdrive/c/Users/michel/AppData/Local/Temp'
HOST = 'spiro1'
BASH_ENV = 'd:/michel/.bashrc'
OneDrive = 'C:\Users\michel\OneDrive'
TTYOut = '/dev/cons0'
PROCESSOR_REVISION = '4e03'
TMPDIR = '/cygdrive/c/Users/michel/AppData/Local/Temp'
PROMPT = '$P$G'
NUMBER_OF_PROCESSORS = '4'
ProgramW6432 = 'C:\Program Files'
COMSPEC = 'C:\WINDOWS\system32\cmd.exe'
APPDATA = 'C:\Users\michel\AppData\Roaming'
TERM = 'cygwin'
WINDIR = 'C:\WINDOWS'
ProgramData = 'C:\ProgramData'
SHLVL = '1'
PROGRAMFILES = 'C:\Program Files'
ALLUSERSPROFILE = 'C:\ProgramData'
TEMP = '/cygdrive/c/Users/michel/AppData/Local/Temp'
SESSIONNAME = 'Console'
ProgramFiles(x86) = 'C:\Program Files (x86)'
HOMEDRIVE = 'C:'
HOMEPATH = '\Users\michel'
mybin = 'c:\mybin'
EXECIGNORE = '*.dll'
BASH_FUNC_lsd%% = '() { ls -log $* | grep "^d"
}'
_ = '/usr/bin/cygcheck'
OLDPWD = '/cygdrive/d/michel'
HKEY_CURRENT_USER\Software\Cygwin
HKEY_CURRENT_USER\Software\Cygwin\Installations
(default) = '\??\C:\cygwin64'
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\Installations
(default) = '\??\c:\cygwin64'
HKEY_LOCAL_MACHINE\SOFTWARE\Cygwin\setup
(default) = 'C:\cygwin64'
obcaseinsensitive set to 1
Cygwin installations found in the registry:
System: Key: e022582115c10879 Path: c:\cygwin64
User: Key: e022582115c10879 Path: C:\cygwin64
c: hd NTFS 133259Mb 38% CP CS UN PA FC EN
d: hd NTFS 807294Mb 39% CP CS UN PA FC EN
r: cd N/A N/A
y: net NTFS 107526Mb 78% CP CS UN PA FC EN
z: net NTFS 354364Mb 80% CP CS UN PA FC EN
C:\cygwin64 / system binary,auto
C:\cygwin64\bin /usr/bin system binary,auto
C:\cygwin64\lib /usr/lib system binary,auto
cygdrive prefix /cygdrive user binary,noacl,posix=0,auto
Found: C:\cygwin64\bin\awk
Found: C:\cygwin64\bin\awk
-> C:\cygwin64\bin\gawk.exe
Found: C:\cygwin64\bin\bash.exe
Found: C:\cygwin64\bin\bash.exe
Found: C:\cygwin64\bin\cat.exe
Found: C:\cygwin64\bin\cat.exe
Found: C:\cygwin64\bin\cp.exe
Found: C:\cygwin64\bin\cp.exe
Not Found: cpp (good!)
Not Found: crontab
Found: C:\cygwin64\bin\find.exe
Found: C:\WINDOWS\system32\find.exe
Warning: C:\cygwin64\bin\find.exe hides C:\WINDOWS\system32\find.exe
Found: C:\cygwin64\bin\find.exe
Not Found: gcc
Not Found: gdb
Found: C:\cygwin64\bin\grep.exe
Found: C:\cygwin64\bin\grep.exe
Found: C:\cygwin64\bin\kill.exe
Found: C:\cygwin64\bin\kill.exe
Found: C:\cygwin64\bin\ld.exe
Found: C:\cygwin64\bin\ld.exe
Found: C:\cygwin64\bin\ls.exe
Found: C:\cygwin64\bin\ls.exe
Not Found: make
Found: C:\cygwin64\bin\mv.exe
Found: C:\cygwin64\bin\mv.exe
Not Found: patch
Found: C:\cygwin64\bin\perl.exe
Found: C:\cygwin64\bin\perl.exe
Found: C:\cygwin64\bin\rm.exe
Found: C:\cygwin64\bin\rm.exe
Found: C:\cygwin64\bin\sed.exe
Found: C:\cygwin64\bin\sed.exe
Not Found: ssh
Found: C:\cygwin64\bin\sh.exe
Found: C:\cygwin64\bin\sh.exe
Found: C:\cygwin64\bin\tar.exe
Found: C:\cygwin64\bin\tar.exe
Found: C:\cygwin64\bin\test.exe
Found: C:\cygwin64\bin\test.exe
Found: C:\cygwin64\bin\vi.exe
Found: C:\cygwin64\bin\vi.exe
Not Found: vim
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485k 2017/06/18 C:\cygwin64\bin\cygcurl-4.dll - os=4.0 img=0.0 sys=5.2
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1549k 2016/08/22 C:\cygwin64\bin\cygdb-5.3.dll - os=4.0 img=0.0 sys=5.2
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124k 2016/08/22 C:\cygwin64\bin\cygdb_cxx-5.3.dll - os=4.0 img=0.0 sys=5.2
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570k 2016/08/22 C:\cygwin64\bin\cygdb_sql-5.3.dll - os=4.0 img=0.0 sys=5.2
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27k 2015/11/17 C:\cygwin64\bin\cygffi-6.dll - os=4.0 img=0.0 sys=5.2
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243k 2016/08/11 C:\cygwin64\bin\cygfontconfig-1.dll - os=4.0 img=0.0 sys=5.2
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55k 2017/06/18 C:\cygwin64\bin\cygformw-10.dll - os=4.0 img=0.0 sys=5.2
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430k 2017/04/30 C:\cygwin64\bin\cygfreebl3.dll - os=4.0 img=0.0 sys=5.2
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597k 2016/07/28 C:\cygwin64\bin\cygfreetype-6.dll - os=4.0 img=0.0 sys=5.2
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83k 2017/03/03 C:\cygwin64\bin\cygz.dll - os=4.0 img=0.0 sys=5.2
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3241k 2017/07/12 C:\cygwin64\bin\cygwin1.dll - os=4.0 img=0.0 sys=5.2
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Cygwin DLL version info:
DLL version: 2.8.2
DLL epoch: 19
DLL old termios: 5
DLL malloc env: 28
Cygwin conv: 181
API major: 0
API minor: 313
Shared data: 5
DLL identifier: cygwin1
Mount registry: 3
Cygwin registry name: Cygwin
Installations name: Installations
Cygdrive default prefix:
Build date:
Shared id: cygwin1S5
Can't find the cygrunsrv utility, skipping services check.
Cygwin Package Information
Last downloaded files to: c:\cygwindownloads
Last downloaded files from: http://mirror.csclub.uwaterloo.ca/cygwin/
Package Version Status
_autorebase 001006-1 OK
alternatives 1.3.30c-10 OK
ascii 3.15-1 OK
attr 2.4.46-1 OK
base-cygwin 3.8-1 OK
base-files 4.2-4 OK
bash 4.4.12-3 OK
bc 1.06.95-2 OK
binutils 2.25-4 OK
bvi 1.3.2-3 OK
bzip2 1.0.6-3 OK
ca-certificates 2.14-1 OK
ccrypt 1.10-1 OK
coreutils 8.26-2 OK
cpio 2.11-3 OK
crypt 1.4-1 OK
cygutils 1.4.16-2 OK
cygwin 2.8.2-1 OK
dash 0.5.9.1-1 OK
dateutils 0.4.0-1 OK
dejavu-fonts 2.37-1 OK
diffutils 3.5-2 OK
dos2unix 7.3.5-1 OK
duff 0.5.2-1 OK
ed 1.14.1-1 OK
editrights 1.03-1 OK
fcrackzip 1.0-1 OK
file 5.30-1 OK
findutils 4.6.0-1 OK
gawk 4.1.4-3 OK
getent 2.18.90-4 OK
grep 3.0-2 OK
groff 1.22.3-1 OK
gzip 1.8-1 OK
hexedit 1.2.13-2 OK
hostname 3.13-1 OK
info 6.4-1 OK
ipc-utils 1.0-2 OK
iprint 1.3-1 OK
less 487-1 OK
libargp 20110921-3 OK
libattr1 2.4.46-1 OK
libblkid1 2.25.2-2 OK
libbz2_1 1.0.6-3 OK
libcom_err2 1.42.12-2 OK
libcrypt0 1.4-1 OK
libcurl4 7.54.1-1 OK
libdb5.3 5.3.28-1 OK
libexpat1 2.2.3-1 OK
libffi6 3.2.1-2 OK
libfontconfig-common 2.12.1-1 OK
libfontconfig1 2.12.1-1 OK
libfreetype6 2.6.5-1 OK
libgcc1 5.4.0-1 OK
libgdbm4 1.12-1 OK
libgmp10 6.1.2-1 OK
libgssapi_krb5_2 1.14.4-1 OK
libiconv 1.14-3 OK
libiconv2 1.14-3 OK
libidn11 1.33-1 OK
libidn2_0 2.0.2-1 OK
libintl8 0.19.8.1-2 OK
libjbig2 2.0-14 OK
libjpeg8 1.5.0-1 OK
libk5crypto3 1.14.4-1 OK
libkrb5_3 1.14.4-1 OK
libkrb5support0 1.14.4-1 OK
liblcms2_2 2.8-1 OK
liblzma5 5.2.3-1 OK
libmcrypt4 2.5.8-1 OK
libmhash2 0.9.9.9-2 OK
libmpfr4 3.1.5-1p10 OK
libncursesw10 6.0-11.20170617 OK
libnghttp2_14 1.23.1-1 OK
libnspr4 4.14-1 OK
libnss3 3.30.2-1 OK
libopenjp2_7 2.1.2-1 OK
libopenjpeg1 1.5.2-3 OK
libopenldap2_4_2 2.4.42-1 OK
libopenssl100 1.0.2k-1 OK
libp11-kit0 0.23.5-1 OK
libpcre1 8.40-3 OK
libpipeline1 1.4.0-1 OK
libpng16 1.6.30-2 OK
libpoppler-cpp0 0.52.0-1 OK
libpoppler62 0.45.0-2 OK
libpoppler66 0.52.0-1 OK
libpopt-common 1.16-2 OK
libpopt0 1.16-2 OK
libpsl5 0.17.0-1 OK
libreadline7 7.0.3-3 OK
libsasl2_3 2.1.26-11 OK
libsigsegv2 2.10-2 OK
libsmartcols1 2.25.2-2 OK
libsqlite3_0 3.19.3-1 OK
libssh2_1 1.7.0-1 OK
libssp0 5.4.0-1 OK
libstdc++6 5.4.0-1 OK
libtasn1_6 4.12-1 OK
libtiff6 4.0.7-1 OK
libunistring2 0.9.6-1 OK
libuuid1 2.25.2-2 OK
login 1.11-1 OK
lynx 2.8.7-2 OK
man-db 2.7.5-2 OK
mcrypt 2.6.8-1 OK
mintty 2.7.9-0 OK
mksh 54-1 OK
ncurses 6.0-11.20170617 OK
openssl 1.0.2k-1 OK
p11-kit 0.23.5-1 OK
p11-kit-trust 0.23.5-1 OK
pdfgrep 1.4.1-1 OK
perl 5.22.4-1 OK
perl_autorebase 5.22.4-1 OK
perl_base 5.22.4-1 OK
poppler-data 0.4.7-1 OK
publicsuffix-list-dafsa 20170424-1 OK
rebase 4.4.2-1 OK
rsh 0.17-2 OK
run 1.3.4-2 OK
sed 4.4-1 OK
tar 1.29-1 OK
terminfo 6.0-11.20170617 OK
tftp 5.2-1 OK
tzcode 2016j-1 OK
tzdata 2017b-1 OK
util-linux 2.25.2-2 OK
vim-minimal 8.0.0647-1 OK
which 2.20-2 OK
xz 5.2.3-1 OK
zlib0 1.2.11-1 OK
Use -h to see help about each section
[-- Attachment #3: Type: text/plain, Size: 219 bytes --]
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^ permalink raw reply [flat|nested] 14+ messages in thread* Re: alias appears to not work inside a called bash script
2017-08-21 22:30 Michel LaBarre
@ 2017-08-21 22:53 ` Eliot Moss
2017-08-22 14:31 ` Stephen John Smoogen
1 sibling, 0 replies; 14+ messages in thread
From: Eliot Moss @ 2017-08-21 22:53 UTC (permalink / raw)
To: cygwin
On 8/21/2017 6:30 PM, Michel LaBarre wrote:
> Hello all,
>
> I have a 4 line bash script:
> #!/bin/bash
> alias nawk=gawk
> alias nawk
> nawk 'BEGIN {FS="^"} ; (length($0) > maxline) { maxline = length($0) ;
> line=$0} ; END{print maxline, line}' $*
>
>
> When I run the script I see:
> alias nawk='gawk'
> /cygdrive/c/mybin/maxline/: line 4: nawk: command not found
>
> It looks like the alias is properly defined but it does not appear to take
> effect.
>
> Same thing happens if I alias to awk instead of qawk.
>
> Same thing happens if I define the alias in .bashrc (I include an echo in
> bashrc to confirm that it is being invoked).
>
> My .bashrc is not likely a factor - I empty it and the result is the same.
> No carriage returns in the script or .bashrc.
>
> I have updated everything August 5th using setup and letting all "Pending"
> pkgs update so I believe I am up to date.
>
> The funny thing is that it works ok from an interactive session, whether the
> alias is explicitly defined in the session or in .bashrc.
From the bash man page:
"Aliases are ot expanded when the shell is not interactive, unless the expand_aliases shell option
is set using shopt (see the description of shopt under SHELL BUILTIN COMMANDS below)."
Could that be the root of your difficulty?
Eliot Moss
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^ permalink raw reply [flat|nested] 14+ messages in thread* Re: alias appears to not work inside a called bash script
2017-08-21 22:30 Michel LaBarre
2017-08-21 22:53 ` Eliot Moss
@ 2017-08-22 14:31 ` Stephen John Smoogen
2017-08-22 14:47 ` Eliot Moss
1 sibling, 1 reply; 14+ messages in thread
From: Stephen John Smoogen @ 2017-08-22 14:31 UTC (permalink / raw)
To: cygwin
On 21 August 2017 at 18:30, Michel LaBarre <michel.labarre@rogers.com> wrote:
>
> Hello all,
>
> I have a 4 line bash script:
> #!/bin/bash
> alias nawk=gawk
> alias nawk
> nawk 'BEGIN {FS="^"} ; (length($0) > maxline) { maxline = length($0) ;
> line=$0} ; END{print maxline, line}' $*
>
>
> When I run the script I see:
> alias nawk='gawk'
> /cygdrive/c/mybin/maxline/: line 4: nawk: command not found
>
I replicated this problem on my system and found that the fix is to add a
shopt -s expand_aliases
at the top of the script. I don't know why the option is turned off
when running scripts versus in a plain script but that seems to be a
default in Cygwin.
> It looks like the alias is properly defined but it does not appear to take
> effect.
>
> Same thing happens if I alias to awk instead of qawk.
>
> Same thing happens if I define the alias in .bashrc (I include an echo in
> bashrc to confirm that it is being invoked).
>
> My .bashrc is not likely a factor - I empty it and the result is the same.
> No carriage returns in the script or .bashrc.
>
> I have updated everything August 5th using setup and letting all "Pending"
> pkgs update so I believe I am up to date.
>
> The funny thing is that it works ok from an interactive session, whether the
> alias is explicitly defined in the session or in .bashrc.
>
> Thank you in advance for any insights.
>
> BTW - I just re-subscribed to cygwin 4-5 hours ago and have not seen any
> mail which seems unusual based on past experience.
>
> Michel LaBarre
> 613-692-0507
>
>
>
>
> --
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Stephen J Smoogen.
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^ permalink raw reply [flat|nested] 14+ messages in thread* Re: alias appears to not work inside a called bash script
2017-08-22 14:31 ` Stephen John Smoogen
@ 2017-08-22 14:47 ` Eliot Moss
2017-08-22 15:19 ` Stephen John Smoogen
0 siblings, 1 reply; 14+ messages in thread
From: Eliot Moss @ 2017-08-22 14:47 UTC (permalink / raw)
To: cygwin
On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
> I replicated this problem on my system and found that the fix is to add a
>
> shopt -s expand_aliases
>
> at the top of the script. I don't know why the option is turned off
> when running scripts versus in a plain script but that seems to be a
> default in Cygwin.
It's a *bash* default - it has nothing to do with Cygwin as distinct
from other bash installations. If you had a different experience
elsewhere, it could be that the default was overridden in some system
wide bashrc file - but that strikes me as unlikely. I suspect that
this is done as a security measure, to prevent an alias from introducing
a surprise.
Regards - EM
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: alias appears to not work inside a called bash script
2017-08-22 14:47 ` Eliot Moss
@ 2017-08-22 15:19 ` Stephen John Smoogen
2017-08-22 16:46 ` Eliot Moss
2017-08-22 17:08 ` cyg Simple
0 siblings, 2 replies; 14+ messages in thread
From: Stephen John Smoogen @ 2017-08-22 15:19 UTC (permalink / raw)
To: moss, cygwin
On 22 August 2017 at 10:47, Eliot Moss <moss@cs.umass.edu> wrote:
> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
>
>> I replicated this problem on my system and found that the fix is to add a
>>
>> shopt -s expand_aliases
>>
>> at the top of the script. I don't know why the option is turned off
>> when running scripts versus in a plain script but that seems to be a
>> default in Cygwin.
>
>
> It's a *bash* default - it has nothing to do with Cygwin as distinct
> from other bash installations. If you had a different experience
> elsewhere, it could be that the default was overridden in some system
> wide bashrc file - but that strikes me as unlikely. I suspect that
> this is done as a security measure, to prevent an alias from introducing
> a surprise.
>
I checked on CentOS and there is no shopt option set in any of the
/etc/ files. It must be a compiled in default of some sort as EL6 and
EL7 both work without an explicit `shopt -s expand_aliases`. I then
tried on an Ubuntu 16.04 system and it works without the `shopt -s
expand_aliases` also.
I didn't have access to anything else at the moment so I can't say
which other systems might actually follow the default other than
Cygwin at the moment.
> Regards - EM
>
>
> --
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Stephen J Smoogen.
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: alias appears to not work inside a called bash script
2017-08-22 15:19 ` Stephen John Smoogen
@ 2017-08-22 16:46 ` Eliot Moss
2017-08-22 18:25 ` Stephen John Smoogen
2017-08-22 17:08 ` cyg Simple
1 sibling, 1 reply; 14+ messages in thread
From: Eliot Moss @ 2017-08-22 16:46 UTC (permalink / raw)
To: cygwin
On 8/22/2017 11:18 AM, Stephen John Smoogen wrote:
> On 22 August 2017 at 10:47, Eliot Moss <moss@cs.umass.edu> wrote:
>> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
>> It's a *bash* default - it has nothing to do with Cygwin as distinct
>> from other bash installations. If you had a different experience
>> elsewhere, it could be that the default was overridden in some system
>> wide bashrc file - but that strikes me as unlikely. I suspect that
>> this is done as a security measure, to prevent an alias from introducing
>> a surprise.
>>
>
> I checked on CentOS and there is no shopt option set in any of the
> /etc/ files. It must be a compiled in default of some sort as EL6 and
> EL7 both work without an explicit `shopt -s expand_aliases`. I then
> tried on an Ubuntu 16.04 system and it works without the `shopt -s
> expand_aliases` also.
>
> I didn't have access to anything else at the moment so I can't say
> which other systems might actually follow the default other than
> Cygwin at the moment.
Hmmm ... One of my servers runs EL7 and it works there exactly as under
Cygwin on my laptop. I wonder: Is there an nawk installed somewhere
on your path on these CentOS and EL* systems? Put another way, if you
put 'type -a nawk' in your script *before* the alias lines, what output
do you get? And what about shopt? I added these lines before the alias
lines:
shopt | grep expand_aliases
type -a nawk
type -t nawk
Regards - Eliot
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: alias appears to not work inside a called bash script
2017-08-22 16:46 ` Eliot Moss
@ 2017-08-22 18:25 ` Stephen John Smoogen
0 siblings, 0 replies; 14+ messages in thread
From: Stephen John Smoogen @ 2017-08-22 18:25 UTC (permalink / raw)
To: moss, cygwin
On 22 August 2017 at 12:45, Eliot Moss <moss@cs.umass.edu> wrote:
> On 8/22/2017 11:18 AM, Stephen John Smoogen wrote:
>>
>> On 22 August 2017 at 10:47, Eliot Moss <moss@cs.umass.edu> wrote:
>>>
>>> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
>
>
>>> It's a *bash* default - it has nothing to do with Cygwin as distinct
>>> from other bash installations. If you had a different experience
>>> elsewhere, it could be that the default was overridden in some system
>>> wide bashrc file - but that strikes me as unlikely. I suspect that
>>> this is done as a security measure, to prevent an alias from introducing
>>> a surprise.
>>>
>>
>> I checked on CentOS and there is no shopt option set in any of the
>> /etc/ files. It must be a compiled in default of some sort as EL6 and
>> EL7 both work without an explicit `shopt -s expand_aliases`. I then
>> tried on an Ubuntu 16.04 system and it works without the `shopt -s
>> expand_aliases` also.
>>
>> I didn't have access to anything else at the moment so I can't say
>> which other systems might actually follow the default other than
>> Cygwin at the moment.
>
>
> Hmmm ... One of my servers runs EL7 and it works there exactly as under
> Cygwin on my laptop. I wonder: Is there an nawk installed somewhere
> on your path on these CentOS and EL* systems? Put another way, if you
> put 'type -a nawk' in your script *before* the alias lines, what output
> do you get? And what about shopt? I added these lines before the alias
> lines:
>
> shopt | grep expand_aliases
> type -a nawk
> type -t nawk
>
> Regards - Eliot
>
>
> --
> Problem reports: http://cygwin.com/problems.html
> FAQ: http://cygwin.com/faq/
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>
OK I figured it out. I didn't copy the original script correctly.
[ssmoogen@el-7 ~]$ ./x.sh foobar
Before alias
expand_aliases on
./x.sh: line 4: type: nawk: not found
After alias
expand_aliases on
nawk is aliased to `/usr/bin/awk'
alias
Hello World!
[ssmoogen@el-7 ~]$ cat x.sh
#!/bin/sh
echo "Before alias"
shopt | grep expand_aliases
type -a nawk
type -t nawk
alias nawk='/usr/bin/awk'
echo "After alias"
shopt | grep expand_aliases
type -a nawk
type -t nawk
nawk '{print $0}' $*
Change that #!/bin/sh to #!/bin/bash
[ssmoogen@el-7 ~]$ ./x.sh foobar
Before alias
expand_aliases off
./x.sh: line 4: type: nawk: not found
After alias
expand_aliases off
./x.sh: line 9: type: nawk: not found
./x.sh: line 11: nawk: command not found
So when you use bourne sh compatibility aliases get expanded. When you
don't.. they do as the reporter says.
--
Stephen J Smoogen.
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: alias appears to not work inside a called bash script
2017-08-22 15:19 ` Stephen John Smoogen
2017-08-22 16:46 ` Eliot Moss
@ 2017-08-22 17:08 ` cyg Simple
2017-08-22 17:14 ` Eliot Moss
1 sibling, 1 reply; 14+ messages in thread
From: cyg Simple @ 2017-08-22 17:08 UTC (permalink / raw)
To: cygwin
On 8/22/2017 11:18 AM, Stephen John Smoogen wrote:
> On 22 August 2017 at 10:47, Eliot Moss <moss@cs.umass.edu> wrote:
>> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
>>
>>> I replicated this problem on my system and found that the fix is to add a
>>>
>>> shopt -s expand_aliases
>>>
>>> at the top of the script. I don't know why the option is turned off
>>> when running scripts versus in a plain script but that seems to be a
>>> default in Cygwin.
>>
>>
>> It's a *bash* default - it has nothing to do with Cygwin as distinct
>> from other bash installations. If you had a different experience
>> elsewhere, it could be that the default was overridden in some system
>> wide bashrc file - but that strikes me as unlikely. I suspect that
>> this is done as a security measure, to prevent an alias from introducing
>> a surprise.
>>
>
> I checked on CentOS and there is no shopt option set in any of the
> /etc/ files. It must be a compiled in default of some sort as EL6 and
> EL7 both work without an explicit `shopt -s expand_aliases`. I then
> tried on an Ubuntu 16.04 system and it works without the `shopt -s
> expand_aliases` also.
>
> I didn't have access to anything else at the moment so I can't say
> which other systems might actually follow the default other than
> Cygwin at the moment.
Are you talking bash as sh or bash as bash? Bash as sh will expand
those aliases. But you should study
http://tldp.org/LDP/abs/html/aliases.html for all your scripts. Are
there environment variables that could affect the outcome?
--
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: alias appears to not work inside a called bash script
2017-08-22 17:08 ` cyg Simple
@ 2017-08-22 17:14 ` Eliot Moss
2017-08-22 19:07 ` cyg Simple
0 siblings, 1 reply; 14+ messages in thread
From: Eliot Moss @ 2017-08-22 17:14 UTC (permalink / raw)
To: cygwin
On 8/22/2017 1:07 PM, cyg Simple wrote:
> On 8/22/2017 11:18 AM, Stephen John Smoogen wrote:
>> On 22 August 2017 at 10:47, Eliot Moss <moss@cs.umass.edu> wrote:
>>> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
> Are you talking bash as sh or bash as bash? Bash as sh will expand
> those aliases. But you should study
> http://tldp.org/LDP/abs/html/aliases.html for all your scripts. Are
> there environment variables that could affect the outcome?
Since the OP has a #! /bin/bash line at the top of his script, I think
he means bash. However, running the script with sh explicitly does act
as you describe, e.g.: sh myscript x y z ... in contrast to: myscript x y z.
Regards - EM
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: alias appears to not work inside a called bash script
2017-08-22 17:14 ` Eliot Moss
@ 2017-08-22 19:07 ` cyg Simple
2017-08-22 19:11 ` cyg Simple
0 siblings, 1 reply; 14+ messages in thread
From: cyg Simple @ 2017-08-22 19:07 UTC (permalink / raw)
To: cygwin
On 8/22/2017 1:13 PM, Eliot Moss wrote:
> On 8/22/2017 1:07 PM, cyg Simple wrote:
>> On 8/22/2017 11:18 AM, Stephen John Smoogen wrote:
>>> On 22 August 2017 at 10:47, Eliot Moss <moss@cs.umass.edu> wrote:
>>>> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
>
>> Are you talking bash as sh or bash as bash? Bash as sh will expand
>> those aliases. But you should study
>> http://tldp.org/LDP/abs/html/aliases.html for all your scripts. Are
>> there environment variables that could affect the outcome?
>
> Since the OP has a #! /bin/bash line at the top of his script, I think
> he means bash. However, running the script with sh explicitly does act
> as you describe, e.g.:Â sh myscript x y z ... in contrast to: myscript x
> y z.
>
There's also --posix and set -o posix which will cause bash to perform
as the OP reports. I'm guessing this to be used in the bash startup
files in a global fashion on those systems that you're not having to
specify to use aliases.
https://www.gnu.org/software/bash/manual/html_node/Bash-POSIX-Mode.html#Bash-POSIX-Mode
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^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: alias appears to not work inside a called bash script
2017-08-22 19:07 ` cyg Simple
@ 2017-08-22 19:11 ` cyg Simple
2017-08-23 19:08 ` Eric Blake
0 siblings, 1 reply; 14+ messages in thread
From: cyg Simple @ 2017-08-22 19:11 UTC (permalink / raw)
To: cygwin
On 8/22/2017 3:07 PM, cyg Simple wrote:
> On 8/22/2017 1:13 PM, Eliot Moss wrote:
>> On 8/22/2017 1:07 PM, cyg Simple wrote:
>>> On 8/22/2017 11:18 AM, Stephen John Smoogen wrote:
>>>> On 22 August 2017 at 10:47, Eliot Moss <moss@cs.umass.edu> wrote:
>>>>> On 8/22/2017 10:31 AM, Stephen John Smoogen wrote:
>>
>>> Are you talking bash as sh or bash as bash? Bash as sh will expand
>>> those aliases. But you should study
>>> http://tldp.org/LDP/abs/html/aliases.html for all your scripts. Are
>>> there environment variables that could affect the outcome?
>>
>> Since the OP has a #! /bin/bash line at the top of his script, I think
>> he means bash. However, running the script with sh explicitly does act
>> as you describe, e.g.:Â sh myscript x y z ... in contrast to: myscript x
>> y z.
>>
>
> There's also --posix and set -o posix which will cause bash to perform
> as the OP reports. I'm guessing this to be used in the bash startup
> files in a global fashion on those systems that you're not having to
> specify to use aliases.
>
> https://www.gnu.org/software/bash/manual/html_node/Bash-POSIX-Mode.html#Bash-POSIX-Mode
>
And --enable-strict-posix-default configure option turns this setting on
by default. I'll leave it up to the Cygwin maintainer to decide if it
should be used.
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^ permalink raw reply [flat|nested] 14+ messages in thread
end of thread, other threads:[~2017-08-25 2:23 UTC | newest]
Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-08-22 19:47 alias appears to not work inside a called bash script Kaz Kylheku
2017-08-25 2:23 ` L A Walsh
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2017-08-21 22:30 Michel LaBarre
2017-08-21 22:53 ` Eliot Moss
2017-08-22 14:31 ` Stephen John Smoogen
2017-08-22 14:47 ` Eliot Moss
2017-08-22 15:19 ` Stephen John Smoogen
2017-08-22 16:46 ` Eliot Moss
2017-08-22 18:25 ` Stephen John Smoogen
2017-08-22 17:08 ` cyg Simple
2017-08-22 17:14 ` Eliot Moss
2017-08-22 19:07 ` cyg Simple
2017-08-22 19:11 ` cyg Simple
2017-08-23 19:08 ` Eric Blake
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