Re: alias appears to not work inside a called bash script

[Stephen John Smoogen <smooge@gmail.com>]

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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