Re: [PLUG] How to find parent in the shell?

[Jeff Abrahamson <jeff@purple.com>]

On Mon, Jan 05, 2004 at 01:38:38AM -0500, Michael C. Toren wrote:
>   [32 lines, 192 words, 1392 characters]  Top characters: etinosal
> 
> On Sun, Jan 04, 2004 at 11:11:19PM -0500, Stephen Gran wrote:
> > What I'm looking for is something like $PPID, or maybe $$, but that
> > gives me a little more information to work with,
> 
> To extract argv[0] of the parent, perhaps you could use:
> 
> 	awk '{print}' /proc/$PPID/cmdline
> 
> Unfortunately, the above command is somewhat deceptive, at least for
> mawk version 1.3.3-8, which is the awk implementation that happens to be
> installed on my local system.  Based on the output of the following test,
> mawk seems to use nul-terminated strings internally, probably the result
> of using stdio:
> 
> 	[mct@ellesmere ~]$ echo -e "foo\0bar"| awk '{print}'
> 	foo
> 
> The net result is that it's easy to extract the first nul-terminated
> string of /proc/$PPID/cmdline using awk, but not the second.  I would
> normally recommend using perl in a situation like this one, however I
> believe the use of perl in Debian init.d scripts is frowned upon?

    | tr '\0' ' '

alternatively

    awk -F'\0' '{print $1}' /proc/$PPID/cmdline

-- 
 Jeff

 Jeff Abrahamson  <http://www.purple.com/jeff/>
 GPG fingerprint: 1A1A BA95 D082 A558 A276  63C6 16BF 8C4C 0D1D AE4B

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