sed anomaly in bash script

sed anomaly in bash script

[cyg Simple]

$ TEST=`echo 'c:\windows' | sed -e s.\\.\\\\.g`
$ echo $TEST
c:\\windows

<file name=sed.sh>
TEST=`echo 'c:\windows' | sed -e s.\\\.\\\\\.g'
echo $TEST
</file>

$ bash -x sed.sh
++ echo 'c:\windows'
++ sed -e 's.\.\g'
sed -e expression #1, char 7: unterminated 's' command
+ TEST=
+ echo

CYGWIN_NT-6.1 HOSTNAME 1.7.32(0.274/5/3) 2014-08-13 23:06 x86_64 Cygwin

Does anyone have a suggestion on turning c:\windows into c:\\windows?

Thanks,
-- 
cyg Simple

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Re: sed anomaly in bash script

[Cliff Hones]

On 14/11/2014 17:20, cyg Simple wrote:
> $ TEST=`echo 'c:\windows' | sed -e s.\\.\\\\.g`
> $ echo $TEST
> c:\\windows
> 
> <file name=sed.sh>
> TEST=`echo 'c:\windows' | sed -e s.\\\.\\\\\.g'
> echo $TEST
> </file>
> 
> $ bash -x sed.sh
> ++ echo 'c:\windows'
> ++ sed -e 's.\.\g'
> sed -e expression #1, char 7: unterminated 's' command
> + TEST=
> + echo
> 
> CYGWIN_NT-6.1 HOSTNAME 1.7.32(0.274/5/3) 2014-08-13 23:06 x86_64 Cygwin
> 
> Does anyone have a suggestion on turning c:\windows into c:\\windows?

Try:
TEST=$(echo 'c:\windows' | sed -e 's.\\.\\\\.g')
echo $TEST

-- Cliff



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Re: sed anomaly in bash script

[David Stacey]

On 14/11/14 17:20, cyg Simple wrote:
> $ TEST=`echo 'c:\windows' | sed -e s.\\.\\\\.g`
> $ echo $TEST
> c:\\windows
>
> <file name=sed.sh>
> TEST=`echo 'c:\windows' | sed -e s.\\\.\\\\\.g'
> echo $TEST
> </file>
>
> $ bash -x sed.sh
> ++ echo 'c:\windows'
> ++ sed -e 's.\.\g'
> sed -e expression #1, char 7: unterminated 's' command
> + TEST=
> + echo
>
> CYGWIN_NT-6.1 HOSTNAME 1.7.32(0.274/5/3) 2014-08-13 23:06 x86_64 Cygwin
>
> Does anyone have a suggestion on turning c:\windows into c:\\windows?

I don't have a Windows PC to hand ATM, but the following works in Fedora 
bash:

#!/usr/bin/bash
TEST=$(echo "c:\windows" | sed -e "s;\\\\;\\\\\\\\;g")
echo ${TEST}


Dave.


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Re: sed anomaly in bash script

[Bob McGowan]

On 11/14/14, 9:20 AM, "cyg Simple" <cygsimple@gmail.com> wrote:

>$ TEST=`echo 'c:\windows' | sed -e s.\\.\\\\.g`
>$ echo $TEST
>c:\\windows
>
><file name=sed.sh>
>TEST=`echo 'c:\windows' | sed -e s.\\\.\\\\\.g'
>echo $TEST
></file>
>
>$ bash -x sed.sh
>++ echo 'c:\windows'
>++ sed -e 's.\.\g'
>sed -e expression #1, char 7: unterminated 's' command
>+ TEST=
>+ echo
>
>CYGWIN_NT-6.1 HOSTNAME 1.7.32(0.274/5/3) 2014-08-13 23:06 x86_64 Cygwin
>
>Does anyone have a suggestion on turning c:\windows into c:\\windows?
>
>Thanks,
>-- 
>cyg Simple
>

The combination of shell globbing and sed metacharacters, with appropriate
escaping, is rather difficult, and nearly impossible to read.

I would suggest using the 'sed -f file' so you can completely eliminate
any shell processing.

The file should contain the string 's/\\/\\\\/', without the quotes ;)

Of course, if you want your script to be in a single file, this won't
work, so one of the other responders answers may be more suitable.

FYI, I would suggest not using the dot as a pattern separator, it could be
confusing to novice readers, and also removes it as a pattern match
character.

Bob


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Re: sed anomaly in bash script

[Brian Inglis]

cyg Simple <cygsimple <at> gmail.com> writes:
> $ TEST=`echo 'c:\windows' | sed -e s.\\.\\\\.g`
> $ echo $TEST
> c:\\windows
> <file name=sed.sh>
> TEST=`echo 'c:\windows' | sed -e s.\\\.\\\\\.g'
> echo $TEST
> </file>
> $ bash -x sed.sh
> ++ echo 'c:\windows'
> ++ sed -e 's.\.\g'
> sed -e expression #1, char 7: unterminated 's' command
> + TEST=
> + echo
> Does anyone have a suggestion on turning c:\windows into c:\\windows?

$ t='c:\windows' ; tt=${t/\\/\\\\} ; echo $t $tt
c:\windows c:\\windows

Never ever use odd numbers of backslashes, when dealing with backslashes! ;^> 
"\\" is the character backslash, doubled for each layer of interpretation it
has to pass thru before it gets to where it's going.



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