shadow/man/login.defs.d/USERDEL_CMD.xml

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<varlistentry>
  <term><option>USERDEL_CMD</option> (string)</term>
  <listitem>
    <para>
      If defined, this command is run when removing a user. It should
      remove any at/cron/print jobs etc. owned by the user to be removed
      (passed as the first argument).
    </para>
    <para>
      The return code of the script is not taken into account.
    </para>
    <para>
      Here is an example script, which removes the user's
      cron, at and print jobs:
      <programlisting>
#! /bin/sh

# Check for the required argument.
if [ $# != 1 ]; then
	echo "Usage: $0 username"
	exit 1
fi

# Remove cron jobs.
crontab -r -u $1

# Remove at jobs.
# Note that it will remove any jobs owned by the same UID,
# even if it was shared by a different username.
find /var/spool/cron/atjobs -name "[^.]*" -type f -user $1 -exec rm {} \;

# Remove print jobs.
lprm $1

# All done.
exit 0
      </programlisting>
    </para>
  </listitem>
</varlistentry>