/usr/share/zsh/help/unhash is in zsh-common 5.0.7-5.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | unhash [ -adfms ] name ...
Remove the element named name from an internal hash table. The
default is remove elements from the command hash table. The -a
option causes unhash to remove regular or global aliases; note
when removing a global aliases that the argument must be quoted
to prevent it from being expanded before being passed to the
command. The -s option causes unhash to remove suffix aliases.
The -f option causes unhash to remove shell functions. The -d
options causes unhash to remove named directories. If the -m
flag is given the arguments are taken as patterns (should be
quoted) and all elements of the corresponding hash table with
matching names will be removed.
unalias
Same as unhash -a.
unfunction
Same as unhash -f.
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