I am trying to make backup of mysql database autoatically using crontab but when I but the command directly int /etc/crontab file the backup created successfully

19 16 * * * root mysqldump -u root -prootroot -h192.168.4.5 radius  | gzip > /etc/freeradius/nh.sql.gz

the above command work nice but when I but this command in file and execute the file from crontab the database can not be created this is the content of /etc/freeradius/backup.sh

mysqldump -u root -prootroot -h192.168.4.5 radius | gzip > /etc/freeradius/nh.sql.gz

and this is the content of crontab file

46 16     * * *   root    /etc/freeradius/backup.sh

but there is no any thing happen even if the command is executed as I saw in syslog file

  • I am betting you have a bug in your script or something, and since you have no MTA you aren't seeing the results. Maybe send your output to a file temporarily. 46 16 * * * root /etc/freeradius/backup.sh > /path/mylogfile.
    – Zoredache
    Aug 24, 2017 at 6:51

2 Answers 2


Create a file db_dump.sh -> script to dump the contents of a database into separate files in the directory "/backups/"


mysqldump -x --add-drop-table  --all-databases > /backups/mysqldb-`date +%F-%I%p`.sql

/usr/bin/mysql -e 'show databases' | /usr/bin/awk '{print $1}' | /bin/grep -v "^Database$" | /usr/bin/xargs -i{} /usr/bin/mysqldump --single-transaction --opt -Q -r /backups/`date +%F-%I%p`-{}.sql {}

gzip -q /backups/*.sql

Make sure that db_dump.sh is executable.

Add to crontab, in my case 10 p.m., daily:

crontab -e

and add:

0 22 * * * /db_dump.sh

For a full backup and nice explanation visit: https://github.com/zauberware/automated-server-backups


Make your backup.sh into a proper shell script:

mysqldump -u root -prootroot -h192.168.4.5 radius | | gzip > /etc/freeradius/nh.sql.gz

and don't forget to make it executable with

 chmod 700 /etc/freeradius/backup.sh
  • thank you for your replay but there is nothing happened Aug 24, 2017 at 6:36
  • What do the log files say?
    – Sven
    Aug 24, 2017 at 6:37
  • Aug 24 09:35:01 muhammad-VirtualBox CRON[1771]: (root) CMD ( /etc/freeradius/backup.txt ) Aug 24 09:35:01 muhammad-VirtualBox CRON[1770]: (CRON) info (No MTA installed, discarding output) Aug 24, 2017 at 6:38
  • Not sure if it is the only issue but the double pipe (... radius | | gzip > ...) present in both the question, and quoted in this answer is probably not helping.
    – Zoredache
    Aug 24, 2017 at 6:49
  • no no it is my typing wrong it is just 1 pipe in the file Aug 24, 2017 at 6:52

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