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centos 7 crontab demo
vim /etc/crontab
content
SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin:/opt/jdk1.8.0_131/bin MAILTO=root HOME=/opt/refreshIp/target/ */1 * * * * ./start.sh # For details see man 4 crontabs # Example of job definition: # .---------------- minute (0 - 59) # | .------------- hour (0 - 23) # | | .---------- day of month (1 - 31) # | | | .------- month (1 - 12) OR jan,feb,mar,apr ... # | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat # | | | | | # * * * * * user-name command to be executed
The file named start.sh(./start.sh) and in path "/opt/refreshIp/target/"(HOME) will be run every minute(*/1 * * * *),in the file, we used java,so that we add "/opt/jdk1.8.0_131/bin" to PATH.
systemctl start crond.service
WARNNING:Never use "crontab -e",this commond will stop your task,it‘s a bug: http://stackoverflow.com/questions/34971575/cron-selinux-security-context-issue
centos 7 crontab demo
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