Table of Contents
How do I restore a crontab file?
You can try to have a look at /var/log/cron and build your crontab again.
- Have a look at the logfile.
- Take the first command and do grep commandname1 /var/log/cron.
- Figure out the systematic behind the times the command was run.
- put that entry to your new crontab.
- execute cat /var/log/cron | grep -v commandname1.
How do I recover a deleted cron job?
Just restore from backup the deleted file in /var/cron/ and the reload the cron service. Or use crontab -e to edit the crontab, and enter the jobs from documentation or memory.
Is there a backup of crontab?
You could just backup the entire /var/spool/cron directory. It contains all crontabs of all users. You can periodically run crontab -l > my_crontab. backup to backup the crontab into file.
How do I copy a crontab from one server to another?
2 Answers
- Copy the relevant crontab entries to the crontab on the new server.
- in case of files in /etc/cron.d or /etc/cron.daily etc., copy the scripts from there to the new server.
- Make sure any scripts, files or other resources you refer to in your current cron jobs are available on the new server.
How do I see crontab history?
Using the grep command, you can view the log to see the last time when the specific script in the cron job was executed. If the cron job does not produce a visible output, then you would need to check to see if the cron job has actually taken place.
Where is crontab file located?
/var/spool/cron/crontabs
When you create a crontab file, it is automatically placed in the /var/spool/cron/crontabs directory and is given your user name. You can create or edit a crontab file for another user, or root, if you have superuser privileges.
How do I copy a crontab file?
Examples
- To copy a file called mycronjobs into the /var/spool/cron/crontabs directory, enter the following: crontab mycronjobs The file will be copied as: /var/spool/cron/crontabs/
- To write the time to the console every hour on the hour, enter: 0 * * * * echo The hour is `date` . >/
How do I copy the latest file in Linux?
Running ls -t /path/to/source | head -1 will return the newest file in the directory /path/to/source so cp “$(ls -t /path/to/source | head -1)” /path/to/target will copy the newest file from source to target . The quotes around the expression are needed in order to deal with file names that contain spaces.
Where can I find crontab logs?
By default installation the cron jobs get logged to a file called /var/log/syslog . You can also use systemctl command to view last few entries.
Where is crontab stored?
The crontab files are stored in /var/spool/cron/crontabs . Several crontab files besides root are provided during SunOS software installation (see the following table). Besides the default crontab file, users can create crontab files to schedule their own system events.
How do I view crontab files?
The crontab -l command displays the contents of a crontab file much the same way that the cat command displays the contents of other types of files. You do not have to change the directory to /var/spool/cron/crontabs directory (where crontab files are located) to use this command.
How do I view crontab?
You can find them in /var/spool/cron/crontabs. The tables contain the cron jobs for all users, except the root user. The root user can use the crontab for the whole system. In RedHat-based systems, this file is located at /etc/cron.
How do I backup a crontab in Linux?
You could just backup the entire /var/spool/cron directory. It contains all crontabs of all users. You can periodically run crontab -l > my_crontab.backup to backup the crontab into file. I made my backup into a cron job.
How to backup and restore cronjobs jobs?
1. Backup Single User Cronjobs. Take the backup of scheduled jobs off current logged in user. This command will save all the output of current jobs listed in a txt file. From where we can simply restore it. To backup jobs of other user in system, For example we are taking backup of all jobs scheduled for user john.
How to recover my crontab from a failed job?
First of all: Always make backups! You can try to have a look at /var/log/cron and build your crontab again. Now you should also execute the grep on older cronlogs to find out jobs that might be run only once in a month. I made a PHP script that does a full recovery of your crontab, based on the log.
How to take backup of cron jobs in CentOS/RHEL?
All the cronjobs we scheduled for a user in CentOS/RHEL are physically stored in file with the username under /var/spool/cron directory. So to take backup of all jobs for all users, simply back /var/spool/cron directory.