at

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#!/bin/sh

FN=""
if [ "-f" = "$1" ]; then
  shift
  FN=$1
  shift
fi

if [ -z "$1" ]; then echo "No date specified"; exit 1; fi
if WHEN=`date -d "$1" +%s`; then
  AT=/var/spool/at/$WHEN.$$
  echo '#!/bin/sh' >$AT.new
  # reproduce the 'at' execution environment here?
  /bin/cat $FN >>$AT.new
  echo 'rm -f $0' >>$AT.new
  /bin/chmod 755 $AT.new
  /bin/mv $AT.new $AT
  echo >/var/spool/at/trigger
else
  exit $?
fi