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/usr/lib/news/bin/expirerm is in inn2 2.6.1-4build1.

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The actual contents of the file can be viewed below.

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#! /bin/sh
. /usr/lib/news/innshellvars

##  $Id: expirerm.in 8572 2009-08-18 13:47:40Z iulius $
##
##  Remove articles listed by expire -z.
##  Remove all files specified in the input file.

MAIL="${MAILCMD} -s 'Problem removing expired files' ${NEWSMASTER}"

#RMPROC="xargs rm"
RMPROC="fastrm -e ${SPOOL}"

if [ -z "$1" ] ; then
    echo "Expire called with zero list of files on `hostname`" \
  | eval ${MAIL}
    exit 0
fi
if [ ! -f $1 ] ; then
    echo "Expire called with no files to expire on `hostname`" \
  | eval ${MAIL}
    exit 0
fi

eval "cd ${SPOOL} \
    && ${RMPROC} <$1 \
    && mv $1 ${MOST_LOGS}/expire.list"
if [ -f $1 ] ; then
    echo "Expire had problems removing articles on `hostname`" \
  | eval ${MAIL}
    exit 1
fi