/usr/share/zsh/help/unlimit is in zsh-common 5.0.7-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | unlimit [ -hs ] resource ...
The resource limit for each resource is set to the hard limit.
If the -h flag is given and the shell has appropriate privi-
leges, the hard resource limit for each resource is removed.
The resources of the shell process are only changed if the -s
flag is given.
The unlimit command is not made available by default when the
shell starts in a mode emulating another shell. It can be made
available with the command `zmodload -F zsh/rlimits b:unlimit'.
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