crontab command usage usage: crontab [-u user] file crontab [-u user] [ -e | -l | -r ] (default operation is replace, per 1003.2) -e (edit user’s crontab) -l (list user’s crontab) -r (delete user’s crontab) -i (prompt before deleting user’s crontab) So, $output = shell_exec(‘crontab -l’); file_put_contents(‘/tmp/crontab.txt’, $output.’* * * * * NEW_CRON’.PHP_EOL); echo … Read more
Instead of creating a crontab to run as the root user, create a crontab for the user that you want to run the script. In your case, crontab -u www-data -e will edit the crontab for the www-data user. Just put your full command in there and remove it from the root user’s crontab.
Here’s a one-liner that doesn’t use/require the new job to be in a file: (crontab -l 2>/dev/null; echo “*/5 * * * * /path/to/job -with args”) | crontab – The 2>/dev/null is important so that you don’t get the no crontab for username message that some *nixes produce if there are currently no crontab entries.
All jobs are executed by a shell, so start that shell snippet by a command to change the directory. cd /path/to/directory && ./bin/myapp Concerning the use of && instead of ;: normally it doesn’t make a difference, but if the cd command fails (e.g. because the directory doesn’t exist) with && the application isn’t executed, … Read more
0 and 7 both stand for Sunday, you can use the one you want, so writing 0-6 or 1-7 has the same result. Also, as suggested by @Henrik, it is possible to replace numbers by shortened name of days, such as MON, THU, etc: 0 – Sun Sunday 1 – Mon Monday 2 – Tue … Read more
Here is an explanation of the crontab format. # 1. Entry: Minute when the process will be started [0-60] # 2. Entry: Hour when the process will be started [0-23] # 3. Entry: Day of the month when the process will be started [1-28/29/30/31] # 4. Entry: Month of the year when the process will … Read more
every minute: * * * * * /path/to/php /var/www/html/a.php every 24hours (every midnight): 0 0 * * * /path/to/php /var/www/html/reset.php See this reference for how crontab works: http://adminschoice.com/crontab-quick-reference, and this handy tool to build cron jobx: http://www.htmlbasix.com/crontab.shtml
You can define environment variables in the crontab itself when running crontab -e from the command line. LANG=nb_NO.UTF-8 LC_ALL=nb_NO.UTF-8 # m h dom mon dow command * * * * * sleep 5s && echo “yo” This feature is only available to certain implementations of cron. Ubuntu and Debian currently use vixie-cron which allows these … Read more
crontab -e add: 30 2 * * * /your/command
Create a .pgpass file in the home directory of the account that pg_dump will run as. The format is: hostname:port:database:username:password Then, set the file’s mode to 0600. Otherwise, it will be ignored. chmod 600 ~/.pgpass See the Postgresql documentation libpq-pgpass for more details.