Korn shell question
Patrick O'Callaghan
pocallaghan at gmail.com
Wed Apr 16 00:51:33 UTC 2008
On Tue, 2008-04-15 at 16:56 -0700, Don Russell wrote:
>
>
> On Tue, Apr 15, 2008 at 4:17 PM, Cameron Simpson <cs at zip.com.au>
> wrote:
>
> On 15Apr2008 12:09, Don Russell <fedora at drussell.dnsalias.com>
> wrote:
> | On Tue, Apr 15, 2008 at 11:08 AM, Patrick O'Callaghan
> <pocallaghan at gmail.com>
> | 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
> | > and work from there.
> |
> | That looks promising... thanks :-)
>
>
> Promising, but will work only on Linux. That may be enough for
> you, but you
> shouldn't forget that it's nonportable.
>
> I just tried this on a Linux system... it makes sense... I tried it on
> a UNIX (AIX) system, and it did not help directly. On UNIX the status
> file appears to be "raw" binary data that maps to a C structure...
> could get tricky trying to extract the correct parts.
I'm amazed it even exists on AIX. I was assuming you meant Linux (this
is a Fedora list after all).
> On Linux, it looks like that decoding is all done and present in
> human-readable terms. :-)
>
>
>
>
> You can probably make that `cat|grep|cut` into a single `sed`
> at some
> performance benefit.
>
> Another approach is to alter your shell environment to always
> set and export
> an environment variable when starting vi (by invoking vi via a
> wrapper script
> or alias or shell function) and then just checking for it.
>
> Though simple, that's not an option for me.... I can't "wrap" vi...
You can. Just put the wrapper in $HOME/bin and set PATH=$HOME/bin:$PATH, e.g.
$ cat $HOME/vi
#!/bin/sh
export MY-SPECIAL-FLAG=1
exec /usr/bin/vi $*
$
poc
More information about the fedora-list
mailing list