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sh: Fix unalias -a while an alias is currently in use.

Description

sh: Fix unalias -a while an alias is currently in use.

It is a rare situation to modify aliases while an alias is currently in use,
but this is handled for plain unalias. Handle it for unalias -a as well.

Details

Provenance
jillesAuthored on
Parents
rS317036: libjail: make allocation in jailparam_all() somewhat more robust.
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