SHELL

start cronjob

#Red Hat / CentOs:

service crond restart

#or

/etc/init.d/crond restart

#Ubuntu:

sudo service cron restart

#or

sudo /etc/init.d/cron restart

how to start cron job

#Red Hat / CentOs:

service crond start

#or

/etc/init.d/crond start

#Ubuntu:

sudo service cron start

#or

sudo /etc/init.d/cron start

create cron job from command line

#write out current crontab
crontab -l > mycron
#echo new cron into cron file
echo "00 09 * * 1-5 echo hello" >> mycron
#install new cron file
crontab mycron
rm mycron

setup cron job

# to list all crontab content (including scheduled jobs)
crontab -l

# to edit crontab file
crontab -e

# once you have finished adding tasks, save the file and exit
# the cron daemon will read and execute the instructions provided