{"id":299,"date":"2018-06-18T20:52:29","date_gmt":"2018-06-18T20:52:29","guid":{"rendered":"http:\/\/dbtut.com\/?p=299"},"modified":"2020-01-14T14:48:05","modified_gmt":"2020-01-14T14:48:05","slug":"how-to-create-crontab-job-on-linux","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/06\/18\/how-to-create-crontab-job-on-linux\/","title":{"rendered":"How To Create Crontab Job On Linux"},"content":{"rendered":"

What is Crontab?<\/h2>\n

If you want to perform regular operations(for example schedule a task) on Linux, you should create a cron job.<\/span><\/p>\n

Create a Crontab Job<\/h2>\n

To create a Crontab Job, we first connect to the server as root.<\/p>\n

Then run the below command and press the insert key from the keyboard.<\/p>\n

crontab -e<\/pre>\n
Finally, we create the job by pasting the following line.<\/p>\n
00 09 * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
On the above line, the sh command after “00 09 * * *” indicates that we will run an sh file.<\/p>\n
The command below specifies that the diskusage.sh file in the “xx \/ postgres_scripts” directory will work.<\/p>\n
\/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
let’s enumerate the parameters in the above line and look at meaning of each number.<\/p>\n
1 2 3 4 5\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n\n\n\n\n\n\n\n
1<\/td>\nIt specifies the minute the job will work(0-59)<\/td>\n<\/tr>\n
2<\/td>\nIt specifies the hour the job will work(0-23)<\/td>\n<\/tr>\n
3<\/td>\nIt specifies the day the job will work(1-31)<\/td>\n<\/tr>\n
4<\/td>\nIt specifies the month the job will work(1-12)<\/td>\n<\/tr>\n
5<\/td>\nIt specifies what day of the week the job will work.(0-7) Sunday=0 or 7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Let’s make some examples.<\/p>\n
Example1:<\/h3>\n
30 16 7 12 *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every year on the 12th month, 7th day, at 16:30.<\/p>\n
Crontab job to run every minutes<\/h3>\n
* * * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every minutes..<\/p>\n
Cron job to run every 5 minutes<\/h3>\n
*\/5 * * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every 5 minutes..<\/p>\n
Cron job to run every 10 minutes<\/h3>\n
*\/10 * * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every 10 minutes..<\/p>\n
Cron job to run every 15 minutes<\/h3>\n
*\/15 * * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every 15 minutes..<\/p>\n
Cron job to run every 30 minutes<\/h3>\n
*\/30 * * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every 30 minutes..<\/p>\n
Cron job to run every hour<\/h3>\n
0 * * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs ever hour at minute 0..<\/p>\n
Cron job to run every 2 hours<\/h3>\n
* *\/2 * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every 2 hours..<\/p>\n
Cron job to run every 3 hours<\/h3>\n
* *\/3 * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every 3 hours..<\/p>\n
Cron job to run every day<\/h3>\n
30 16 * * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every year, every month, every day at 16:30.<\/p>\n
Cron job to run every week on Sunday<\/h3>\n
0 0 * * 0\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every year, every month, every week on Sunday at 00:00.<\/p>\n
Cron job to run on weekdays<\/h3>\n
0 0 * * 1-5\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs on weekday.(Monday,Tuesday,Wednesday,Thursday and Friday at 00:00).<\/p>\n
Cron job to run on weekend<\/h3>\n
0 0 * * 6,0\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs on weekend.(Saturday and Sunday at 00:00).<\/p>\n
Cron job to run every month<\/h3>\n
0 0 1 * *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every month.(At 00:00 on day-of-month 1).<\/p>\n
Cron job to run every year<\/h3>\n
0 0 1 1 *\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs every year.(At 00:00 on day-of-month 1 in January.)<\/p>\n
Cron job run on specific day<\/h3>\n
30 16 * * 6\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line crontab, diskusage.sh runs every year, every month, every week on Saturday at 16:30.<\/p>\n
Cron job to run on last day of month<\/h3>\n
59 23 28-31 * * [ \"$(date +%d -d tomorrow)\" = \"01\" ] && \/root\/script.sh\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs on last day of month at 23:59)<\/p>\n
Cron job to run first day of month<\/h3>\n
0 0 1 * *&& \/root\/script.sh\u00a0 sh \/xx\/postgres_scripts\/diskusage.sh<\/pre>\n
If you add the above line to crontab, diskusage.sh runs on first day of month at 00:00)<\/p>\n\n
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<\/div>\n","protected":false},"excerpt":{"rendered":"
What is Crontab? If you want to perform regular operations(for example schedule a task) on Linux, you should create a cron job. Create a Crontab Job To create a Crontab Job, we first connect to the server as root. Then run the below command and press the insert key from the keyboard. crontab -e Finally, …<\/p>\n
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To Create Crontab Job On Linux - Database Tutorials<\/title>\n<meta name=\"description\" content=\"How To Create Crontab Job On Linux\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/dbtut.com\/index.php\/2018\/06\/18\/how-to-create-crontab-job-on-linux\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Create Crontab Job On Linux - Database Tutorials\" \/>\n<meta property=\"og:description\" content=\"How To Create Crontab Job On Linux\" \/>\n<meta property=\"og:url\" content=\"https:\/\/dbtut.com\/index.php\/2018\/06\/18\/how-to-create-crontab-job-on-linux\/\" \/>\n<meta property=\"og:site_name\" content=\"Database Tutorials\" \/>\n<meta property=\"article:published_time\" content=\"2018-06-18T20:52:29+00:00\" \/>\n<meta property=\"article:modified_time\" 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