/usr/share/zsh/help/wait is in zsh-common 5.1.1-1ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | wait [ job ... ]
Wait for the specified jobs or processes. If job is not given
then all currently active child processes are waited for. Each
job can be either a job specification or the process ID of a job
in the job table. The exit status from this command is that of
the job waited for.
It is possible to wait for recent processes (specified by
process ID, not by job) that were running in the background even
if the process has exited. Typically the process ID will be
recorded by capturing the value of the variable $! immediately
after the process has been started. There is a limit on the
number of process IDs remembered by the shell; this is given by
the value of the system configuration parameter CHILD_MAX. When
this limit is reached, older process IDs are discarded, least
recently started processes first.
Note there is no protection against the process ID wrapping,
i.e. if the wait is not executed soon enough there is a chance
the process waited for is the wrong one. A conflict implies
both process IDs have been generated by the shell, as other pro-
cesses are not recorded, and that the user is potentially inter-
ested in both, so this problem is intrinsic to process IDs.
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