How do I wait for a specific process to die? I want to do something like:

waitpid 1234&&(echo "done!" | Mail -s "PROC DONE"

I'm sure this is trivial, but I can't find a way to do it.

I wrote a Perl script that checks every second if /proc/pid exists,
but that only works if /proc is mounted + I'm now on VMs which can't
easily mount /proc

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