[LINUX] Setting to output the log of cron execution


I set to output the log of cron execution to a log file.


Ubuntu 16.04.5 LTS


Open this file.

vi /etc/rsyslog.d/50-default.conf

By default, this line should be commented, so uncomment and update.

cron.*                         /var/log/cron.log

However, it could not be updated because it was Read Only. Change the permissions so that you can write.

sudo chmod 646 /etc/rsyslog.d/50-default.conf
(Change before)-rw-r--r--
(After change)-rw-r--rw-

The cron log is output by rsyslog. The rsyslog service must be restarted for the above settings to take effect.

service rsyslog restart

Make sure that the service is started just in case.

service --status-all | grep rsyslog

The log will be output here. rsyslog will write the cron log for you. A new cron.log is created when the first log is written to cron.log.




Instead of writing the cron log with rsyslog, make the command executed by cron the standard output log.

Add the following two lines with ** crontab -e **.

1 12 * * * cd $HOME && date "+\%Y/\%m/\%d \%H:\%M:\%S" >> ./syori01.log
2 12 * * * cd $HOME && /usr/local/rbenv/shims/ruby syori01.rb >> ./syori01.log


At 12:01, write the system date and time to syori01.log, and then at 12:02, execute the ruby program called syori01.rb and output it to syori01.log as standard. The caveat is that if you specify a date in cron, it won't work unless you escape the%.

・ To find the place where ruby is stored, do ** which ruby **. -This process is executed in the Home directory.


https://qiita.com/[email protected]/items/70bc148d782e96492282

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