[Gllug] Attach a command to run on completion of another process

[- Tethys]

On 2/28/07, Andrew Roberts <ar at nooneishere.co.uk> wrote:

> This doesn't appear to do what you want, but neither can I fully work
> out what the command does. Does anyone know how to use this?

It simply maps a jobspec to a pid, and runs a given command. Use it
like this[1]:

mrburns:~% jobs
[1]+  Running                 xterm &
mrburns:~% jobs -x echo Job 1 has PID %1
Job 1 has PID 10829

It's not as useful as you might hope, as the jobspec is only expanded
if it's surrounded by whitespace. Otherwise, you could do useful
things like see which file descriptors a background job had open. But
sadly it does't work:

mrburns:~% jobs -x ls -l /proc/%1/fd
ls: /proc/%1/fd: No such file or directory

You can get around it by passing the expanded PID to a trivial shell
script, but that defeats the point of the exercise somewhat.

Tet

[1] Yes, I know that in this trivial example, "jobs -l" would have sufficed.
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