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Editorial Team
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Asked: 2026-06-01T07:18:10+00:00

I have a cronjob calling a shell script. Inside that shell script and I

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I have a cronjob calling a shell script. Inside that shell script and I have these lines:

php backup.php
(cat db-backup.sql ; uuencode db-backup.sql db-backup.sql) | mailx -s 'Database Daily Backup' mail@mail.com
rm -f db-backup.sql

When I run this shell script manually like this ./backup it creates a backup file of database, sends me an email and deletes the file. When cron calls this script It sends me a blank e-mail and it does not call/run the php file properly. What could be the cause of this problem?

Note: both shell script and php file has -rwxr-xr-x perms.

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1 Answer

  1. Editorial Team

    cron is probably not executing the script in a directory where your user account has write permissions. (On my system, ls -l /proc/$(pidof cron)/cwd shows the current working directory is /var/spool/cron/.)

    Put an explicit cd /path/to/writable/directory immediately before the php line.

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