An experienced Linux sysadmin knows the importance of running the routine maintenance jobs in the background automatically.
Linux Cron utility is an effective way to schedule a routine background job at a specific time and/or day on an on-going basis.
MIN HOUR DOM MON DOW CMD
Field | Description | Allowed Value |
---|---|---|
MIN | Minute field | 0 to 59 |
HOUR | Hour field | 0 to 23 |
DOM | Day of Month | 1-31 |
MON | Month field | 1-12 |
DOW | Day Of Week | 0-6 |
CMD | Command | Any command to be executed. |
The basic usage of cron is to execute a job in a specific time as shown below. This will execute the Full backup shell script (full-backup) on 10th June 08:30 AM.
Please note that the time field uses 24 hours format. So, for 8 AM use 8, and for 8 PM use 20.
30 08 10 06 * /home/dinesh/full-backup
2. Schedule a Job For More Than One Instance (e.g. Twice a Day)
The following script take a incremental backup twice a day every day.
This example executes the specified incremental backup shell script (incremental-backup) at 11:00 and 16:00 on every day. The comma separated value in a field specifies that the command needs to be executed in all the mentioned time.
00 11,16 * * * /home/dinesh/bin/incremental-backup
If you wanted a job to be scheduled for every hour with in a specific range of time then use the following.
This example checks the status of the database everyday (including weekends) during the working hours 9 a.m – 6 p.m
00 09-18 * * * /home/dinesh/bin/check-db-status
This example checks the status of the database every weekday (i.e excluding Sat and Sun) during the working hours 9 a.m – 6 p.m.
00 09-18 * * 1-5 /home/dinesh/bin/check-db-status
To view your crontab entries type crontab -l from your unix account as shown below.
dinesh@dev-db$ crontab -l @yearly /home/dinesh/annual-maintenance */10 * * * * /home/dinesh/check-disk-space [Note: This displays crontab of the current logged in user]
Login as root user (su – root) and do crontab -l as shown below.
root@dev-db# crontab -l no crontab for root
To view crontab entries of other Linux users, login to root and use -u {username} -l as shown below.
root@dev-db# crontab -u sathiya -l @monthly /home/sathiya/monthly-backup 00 09-18 * * * /home/sathiya/check-db-status
To edit a crontab entries, use crontab -e as shown below. By default this will edit the current logged-in users crontab.
dinesh@dev-db$ crontab -e @yearly /home/dinesh/centos/bin/annual-maintenance */10 * * * * /home/dinesh/debian/bin/check-disk-space ~ "/tmp/crontab.XXXXyjWkHw" 2L, 83C [Note: This will open the crontab file in Vim editor for editing. Please note cron created a temporary /tmp/crontab.XX... ]
When you save the above temporary file with :wq, it will save the crontab and display the following message indicating the crontab is successfully modified.
~ "crontab.XXXXyjWkHw" 2L, 83C written crontab: installing new crontab
Login as root user (su – root) and do crontab -e as shown below.
root@dev-db# crontab -e
To edit crontab entries of other Linux users, login to root and use -u {username} -e as shown below.
root@dev-db# crontab -u sathiya -e @monthly /home/sathiya/fedora/bin/monthly-backup 00 09-18 * * * /home/sathiya/ubuntu/bin/check-db-status ~ ~ ~ "/tmp/crontab.XXXXyjWkHw" 2L, 83C
Ideally you may not have a requirement to schedule a job every minute. But understanding this example will will help you understand the other examples mentioned below in this article.
* * * * * CMD
The * means all the possible unit — i.e every minute of every hour through out the year. More than using this * directly, you will find it very useful in the following cases.
Use the following, if you want to check the disk space every 10 minutes.
*/10 * * * * /home/dinesh/check-disk-space
It executes the specified command check-disk-space every 10 minutes through out the year. But you may have a requirement of executing the command only during office hours or vice versa. The above examples shows how to do those things.
Instead of specifying values in the 5 fields, we can specify it using a single keyword as mentioned below.
There are special cases in which instead of the above 5 fields you can use @ followed by a keyword — such as reboot, midnight, yearly, hourly.
Keyword | Equivalent |
---|---|
@yearly | 0 0 1 1 * |
@daily | 0 0 * * * |
@hourly | 0 * * * * |
@reboot | Run at startup. |
If you want a job to be executed on the first minute of every year, then you can use the @yearly cron keyword as shown below.
This will execute the system annual maintenance using annual-maintenance shell script at 00:00 on Jan 1st for every year.
@yearly /home/dinesh/red-hat/bin/annual-maintenance
It is as similar as the @yearly as above. But executes the command monthly once using @monthly cron keyword.
This will execute the shell script tape-backup at 00:00 on 1st of every month.
@monthly /home/dinesh/suse/bin/tape-backup
Using the @daily cron keyword, this will do a daily log file cleanup using cleanup-logs shell scriptat 00:00 on every day.
@daily /home/dinesh/arch-linux/bin/cleanup-logs "day started"
Using the @reboot cron keyword, this will execute the specified command once after the machine got booted every time.
@reboot CMD
By default crontab sends the job output to the user who scheduled the job. If you want to redirect the output to a specific user, add or update the MAIL variable in the crontab as shown below.
dinesh@dev-db$ crontab -l MAIL="dinesh" @yearly /home/dinesh/annual-maintenance */10 * * * * /home/dinesh/check-disk-space [Note: Crontab of the current logged in user with MAIL variable]
If you wanted the mail not to be sent to anywhere, i.e to stop the crontab output to be emailed, add or update the MAIL variable in the crontab as shown below.
MAIL=""
You cannot schedule a every-second cronjob. Because in cron the minimum unit you can specify is minute. In a typical scenario, there is no reason for most of us to run any job every second in the system.
All the above examples we specified absolute path of the Linux command or the shell-script that needs to be executed.
For example, instead of specifying /home/dinesh/tape-backup, if you want to just specify tape-backup, then add the path /home/dinesh to the PATH variable in the crontab as shown below.
dinesh@dev-db$ crontab -l PATH=/bin:/sbin:/usr/bin:/usr/sbin:/home/dinesh @yearly annual-maintenance */10 * * * * check-disk-space [Note: Crontab of the current logged in user with PATH variable]
Instead of directly editing the crontab file, you can also add all the entries to a cron-file first. Once you have all thoese entries in the file, you can upload or install them to the cron as shown below.
dinesh@dev-db$ crontab -l no crontab for dinesh $ cat cron-file.txt @yearly /home/dinesh/annual-maintenance */10 * * * * /home/dinesh/check-disk-space dinesh@dev-db$ crontab cron-file.txt dinesh@dev-db$ crontab -l @yearly /home/dinesh/annual-maintenance */10 * * * * /home/dinesh/check-disk-space
Note: This will install the cron-file.txt to your crontab, which will also remove your old cron entries. So, please be careful while uploading cron entries from a cron-file.txt.
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