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Subject: Re: ps with command line arguments
From: AZ 9901 <az9901 AT gmail DOT com>
In-Reply-To: <ADAB05FC-DE25-4BEC-9362-081C5046E57A@gmail.com>
Date: Tue, 7 May 2013 15:30:37 +0200
Message-Id: <14983C5E-E9B8-49A8-B554-A9C5C026426F@gmail.com>
References: <ADAB05FC-DE25-4BEC-9362-081C5046E57A AT gmail DOT com>
To: cygwin AT cygwin DOT com
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Le 7 mai 2013 à 10:46, AZ 9901 a écrit :

> Hello,
> 
> I run a bash script in a multi-user environment.
> This script uses "ps -ef" in particular to list all its instances.
> 
> On a common UNIX / Linux system, it gives something like this :
> bobby     20326 20318  0 10:21 ?        00:00:00 /bin/bash ./myscript.sh
> marty     20330 20342  0 10:23 ?        00:00:00 /bin/bash ./myscript.sh
> dudul     20339 20363  0 10:25 ?        00:00:00 /bin/bash ./myscript.sh
> Perfect !
> 
> With Cygwin, "ps -ef" does not give command line arguments, so the script can't list its instances.
> I was thinking about using procps or printing /proc/*/cmdline.
> However, some of the users do not have admin rights, so they are not allowed to access /proc/<pid>/cmdline, /proc/<pid>/stat etc... of other users...
> 
> This is why "ps -ef" giving command line arguments would be really perfect !

I also just tested a workaround using the bash builtin command "exec".
I put the following lines at the beginning of my script :

if [[ ! "$EXEC" ]]
then
    export EXEC=1
    exec -a myscript /bin/bash "$0" "$@"
fi

Then, on a common UNIX / Linux system, "ps -ef" gives something like this :
bobby     20326 20318  0 10:21 ?        00:00:00 myscript ./myscript.sh
marty     20330 20342  0 10:23 ?        00:00:00 myscript ./myscript.sh
dudul     20339 20363  0 10:25 ?        00:00:00 myscript ./myscript.sh
Perfect.

But on Cygwin, it still gives this :
bobby     20326 20318  0 10:21 ?        00:00:00 /usr/bin/bash
marty     20330 20342  0 10:23 ?        00:00:00 /usr/bin/bash
dudul     20339 20363  0 10:25 ?        00:00:00 /usr/bin/bash

I would have liked to see "myscript" instead of "/usr/bin/bash"...

Could ps command be corrected / improved to display "myscript" and/or command line arguments ?

Or perhaps there is another solution ?

Thank you very much,

Best regards,

Ben


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