Korn shell question

[Don Russell]

On Wed, Apr 16, 2008 at 8:44 AM, Patrick O'Callaghan <pocallaghan at gmail.com>
wrote:

>
> On Wed, 2008-04-16 at 10:41 -0400, Bill Davidsen wrote:
> > Patrick O'Callaghan wrote:
> > > On Tue, 2008-04-15 at 10:49 -0700, Don Russell wrote:
> > >> How can I tell, from a Korn shell script, if the script is running in
> > >> a vi sub-shell?
> > >>
> > >> I have a script that has a problem when run from a vi subshell, and
> > >> I'd like to check for that condition and just issue an error message.
> > >> (I know that's not the solution to the problem, but the thing that
> > >> fails is being replaced, so this is a temporary "fix")
> > >
> > > Try:
> > >
> > > ls -l /proc/`cat /proc/$$/status|grep PPid|cut -f2`/exe
> >
> > What on Earth are you doing here?
> > 1) unless you have some reason to doubt the value of $PPID, you are just
> >     making this look complex
> > 2) if this is a login shell, you will not have permission to read the
> >     exe symbolic link.
> > 3) you probably just want to see if /proc/$PPIC/cmdline matches vi
>
> Duh, yes. The OP wants to know if his script is being executed from
> 'vi'. That's one way to do it. You're right about the permissions of
> course, my bad, but using $PPID doesn't change that in the script.
>
> Here's a better one:
>
> ps -p $PPID -o comm=
>
>
That's GREAT! It's exactly what I need.... and bonus points for it working
on other platforms too ;-)

Thank you :-)
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