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. 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.
View Users Cronjob
Use the following syntax to view vivek users cronjob:
crontab -u userName -l crontab -u vivek -l |
View Root User Cronjob
Just type the following command:
crontab -l |
View /etc/crontab
A cronjob can be also run from /etc/crontab file. To view it, enter:
# less /etc/crontab
View Daily Cronjob
Type the following commands:
cd /etc/cron.daily/ ls -l cat filename |
View Hourly Cronjobs
Type the following commands:
cd /etc/cron.hourly/ ls -l cat filename |
View Weekly Cronjobs
Type the following commands:
cd /etc/cron.weekly/ ls -l cat filename |
View Monthly Cronjobs
Type the following commands:
cd /etc/cron.monthly/ ls -l cat filename |
View Software (Package) Specific Cronjobs
Type the following commands
cd /etc/cron.d/ ls -l cat filename |
This entry is 5 of 15 in the Linux Cron Jobs Howto & Tutorial series. Keep reading the rest of the series:
- What is cron on a Linux or Unix-like systems?
- HowTo: Add Jobs To cron Under Linux or UNIX?
- Linux Verify crond Daemon And Cronjobs Are Running
- Linux Start Restart and Stop The Cron or Crond Service
- Linux: List / Display All Cron Jobs
- Linux / UNIX Crontab File Location
- Linux / UNIX: Change Crontab Email Settings ( MAILTO )
- Disable The Mail Alert By Crontab Command On a Linux or Unix-like Systems
- Linux: At What Time Cron Entries In cron.daily, cron.weekly, cron.monthly Run?
- Linux Execute Cron Job After System Reboot
- Linux / UNIX Setup and Run PHP Script As A Cron Job
- How to run crontab job every minute on a Linux or Unix-like system
- Run crontab (cron jobs) Every 10 Minutes
- Cron Job Script Execution on the Last Day of a Month
- Run crontab (cron jobs) every 1 minute
10 comment
Thank you for a very good summary. If a cron task is required to be executed on a schedule other than hourly, daily, weekly, or monthly, it can be added to the /etc/cron.d/ directory.
view crontab from all users:
cat /var/spool/cron/*
crontab -l just lists the jobs for the user who ran the command.
So, to view root’s jobs, you’d either need to be logged in as root or run it with sudo.
There is also very handy script to view all users crontabs:
http://stackoverflow.com/questions/134906/how-do-i-list-all-cron-jobs-for-all-users
How do we check running cronjob process.
I guess, its from ps -ef | grep file.sh
or any other suggestion.
To check running cronjob process use:crontab -l
To list all user’s crobtab:
for user in $(cut -f1 -d: /etc/passwd); do crontab -u $user -l; done
How does one check the “version” of cron running? How can one know if their cron is a “vixie-style” crontab or not?
Try the following:
I do this task manually
./getConfig ‘indirect’ ‘./(Command task)’ ‘./(Credential.csv’ ‘/usr/cronout/’ (standalone server)
in command task there is a “cat /etc/ssh/sshd_config” but I saw blank sshd_config even though I can see details about sshd_config when I run those task manually. Can you help me?