prerm is in libpam-unix2 1:2.6-2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #!/bin/sh
set -e
if [ "$1" != upgrade ]
then
if override=$(dpkg-statoverride --list /sbin/unix2_chkpwd) && \
[ "$override" = "root root 4755 /sbin/unix2_chkpwd" ]
then
dpkg-statoverride --remove /sbin/unix2_chkpwd
chown root:shadow /sbin/unix2_chkpwd
chmod 2755 /sbin/unix2_chkpwd
fi
fi
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