hi
for cron job
you need to follow the steps
chkconfig crond on
service crond restart
crontab -e -u root ---- this is for creating cron for a user *** here user is root you can give any name
#min Hour DoM Month Dow command
0 4 * * 1,3,5 mail -s "boo" $LOGNAME < boo.txt
this particular cron will send a message to the logged user a message from boo.txt on mon wed and fri every 4 hours
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