Linux List / Display and view all cron jobs

How do I view currently setup or all running cron jobs under a Linux or Unix-like operating systems?

The cron service searches its spool area (usually /var/spool/cron/crontabs) for crontab files (which are named after user accounts); crontabs found are loaded into memory. cron also reads /etc/crontab, which is in a slightly different format. Additionally, cron reads the files in /etc/cron.d: it treats the files in /etc/cron.d as in the same way as the /etc/crontab file. [donotprint][/donotprint]The intended purpose of /etc/cron.d/ directory feature is to allow packages that require finer control of their scheduling than the /etc/cron.{daily,weekly,monthly} directories to add a crontab file to /etc/cron.d.

Linux View Users Cronjob

Use the following syntax to view vivek users cronjob:

sudo crontab -u userName -l
sudo crontab -u vivek -l

sudo crontab -u userName -l
sudo crontab -u vivek -l

How to Display all jobs in cron / crontab

I run the following as root user:
crontab -l

View Root User Cronjob on Linux

Just type the following command as root user:

crontab -l

crontab -l

OR

sudo crontab -l

sudo crontab -l

Sample outputs:

# Edit this file to introduce tasks to be run by cron.
# 
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
# 
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use '*' in these fields (for 'any').# 
# Notice that tasks will be started based on the cron's system
# daemon's notion of time and timezones.
# 
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
# 
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
# 
# For more information see the manual pages of crontab(5) and cron(8)
# 
# m h  dom mon dow   command
#* * * * *	root /root/bin/master.replication
@reboot /bin/sleep 100;/bin/systemctl restart memcached

# Edit this file to introduce tasks to be run by cron.
#
# Each task to run has to be defined through a single line
# indicating with different fields when the task will be run
# and what command to run for the task
#
# To define the time you can provide concrete values for
# minute (m), hour (h), day of month (dom), month (mon),
# and day of week (dow) or use ‘*’ in these fields (for ‘any’).#
# Notice that tasks will be started based on the cron’s system
# daemon’s notion of time and timezones.
#
# Output of the crontab jobs (including errors) is sent through
# email to the user the crontab file belongs to (unless redirected).
#
# For example, you can run a backup of all your user accounts
# at 5 a.m every week with:
# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/
#
# For more information see the manual pages of crontab(5) and cron(8)
#
# m h dom mon dow command
#* * * * * root /root/bin/master.replication
@reboot /bin/sleep 100;/bin/systemctl restart memcached

How to view /etc/crontab on Linux or Unix

A cronjob can be also run from /etc/crontab file. To view it run the following less command:
# less /etc/crontab
Sample outputs:

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.
 
SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
 
# m h dom mon dow user	command
17 *	* * *	root    cd / && run-parts --report /etc/cron.hourly
25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6	* * 7	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6	1 * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don’t have to run the `crontab’
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do. SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command
17 * * * * root cd / && run-parts –report /etc/cron.hourly
25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.daily )
47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.weekly )
52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts –report /etc/cron.monthly )
#

Linux view daily cronjob

Type the following commands to display daily crontab:

cd /etc/cron.daily/
ls -l
cat filename
cas passwd

cd /etc/cron.daily/
ls -l
cat filename
cas passwd

Linux view running daily cron jobs

Unix view hourly cronjobs

Type the following commands:

cd /etc/cron.hourly/
ls -l
cat filename

cd /etc/cron.hourly/
ls -l
cat filename

How to view Weekly Cron jobs on Linux

Type the following commands:

cd /etc/cron.weekly/
ls -l
cat filename

cd /etc/cron.weekly/
ls -l
cat filename

Command to see monthly Cronjobs / crontabs

Excute the following cat command to see running cron jobs:

cd /etc/cron.monthly/
ls -l
cat filename

cd /etc/cron.monthly/
ls -l
cat filename

View Software (Package) Specific Cronjobs

Run the following commands

cd /etc/cron.d/
ls -l
cat filename
cat renew-ssl-certs

cd /etc/cron.d/
ls -l
cat filename
cat renew-ssl-certs

This entry is 5 of 15 in the Linux Cron Jobs Howto & Tutorial series. Keep reading the rest of the series:

  1. What is cron on a Linux or Unix-like systems?
  2. HowTo: Add Jobs To cron Under Linux or UNIX?
  3. Linux Verify crond Daemon And Cronjobs Are Running
  4. Linux Start Restart and Stop The Cron or Crond Service
  5. Linux: List / Display All Cron Jobs
  6. Linux / UNIX Crontab File Location
  7. Linux / UNIX: Change Crontab Email Settings ( MAILTO )
  8. Disable The Mail Alert By Crontab Command On a Linux or Unix-like Systems
  9. Linux: At What Time Cron Entries In cron.daily, cron.weekly, cron.monthly Run?
  10. Linux Execute Cron Job After System Reboot
  11. Linux / UNIX Setup and Run PHP Script As A Cron Job
  12. How to run crontab job every minute on a Linux or Unix-like system
  13. Run crontab (cron jobs) Every 10 Minutes
  14. Cron Job Script Execution on the Last Day of a Month
  15. Run crontab (cron jobs) every 1 minute

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.