[talk] Concisely determining exit codes of background jobs

[Ipsen S Ripsbusker]

As a tangent to Ivan's talk, we discussed the merits of checking of exit
status (or other indicators of success) of parallel calls to scp.
If I recall correctly, Ivan started multiple background scp processes
with &, and then he waited for them to complete with the following
command, which always exits 0.

  wait

The following command waits for the same background processes, and
it still exits 0 if all processes exited 0. It differs in that it
exits 1 if any process exited with something other than 0.

  wait `jobs -p`

Note that these are of course the standard wait(1) and jobs(1),
which are usually builtins in sh(1).