#$ at -f crontab.command 042707
#job 15 at 2007-04-27 12:56
#$ cat crontab.command 
#cat /home/eukim/crontab.data |crontab
#$ cat crontab.data 

#files
CRON_DATA="${HOME}/atcron.data.`date '+%Y%m%d%H%M%S'`"
CRON_COMMAND="${HOME}/atcron.command.`date '+%Y%m%d%H%M%S'`"

#existing crontab
CRONTAB_L="`crontab -l`"

#Output summary and read in when command will run
echo "Enter time for at job to enforce crontab: "
echo "Example format: MMDDYY (see \"man at\" for further details)"
echo -n "time: "
read TIME

#create files
echo "#Enter crontab entries to overwrite the existing crontab" > $CRON_DATA
echo "#minute, hour, day of month, month, day of week" >> $CRON_DATA
echo "${CRONTAB_L}" >> $CRON_DATA
#create command/script that will apply the above crontab data to cron
echo "cat ${CRON_DATA} | crontab" > ${CRON_COMMAND}

#edit cron file
vi $CRON_DATA

at -f $CRON_COMMAND $TIME