Basic Linux TutorialIntroduction – What is it? Why to learn? Linux installation directory structures Boot process Run levels in Linux Desktop Environments Different shells BASH Internal and External Commands Basic Linux Commands Important files and directories in Linux Environmental and Shell Variables Command history in Linux Character classes in Linux Text editors vim nano Searching files Creating new files Viewing File Contents File commands File permissions and ownership WildCards (Globbing) in files File compression Directory commands xargs command in Linux Comparing files Searching patterns using grep command Translating the characters using tr command Extracting data using cut command Stream editing using sed command Data extraction and reporting using awk command Sorting the file or string input uniq command in Linux Difference between grep, tr, cut, sed and awk commands Hardware commands Hard disk and memory space commands Working with Processes Managing Jobs Working with cron jobs Service command in Linux Network commands Managing Users and Groups Other Popular commands Standard streams and Redirection Pipes Package Managers in Linux
crons jobs in linux shellcron is used to schedule the jobs in Linux. It allows you do below things.
- Add the job in crontab for specific user
- Remove the job in crontab
- View history of cron jobs
Adding new cron jobYou can add cron job using below command.
Then you need to add the jobs using below syntax.
For example – below command will schedule a cron job to run after every 20 minutes.
minute hour dayOfMonth month dayOfWeek <command>
*/20 * * * * /home/myjob.sh
View cron jobsBelow command will list all cron jobs of current user.
Below command will list all cron jobs of given user.
$ crontab -l
$ crontab -u <user-name> -l
Removing cron jobsBelow command will remove all cron jobs of current user.
$ crontab -r
Complex problems, Simple Solutions