A (cron) job to run if file has changed

backup cron centos sqlite centos8

I need to backup a live sqlite db by running a command once a day. Only if the db file has changed since last backup. How could it be achieved on Centos 8 ?


The touch command has the ability to set a file's times to be the same as another file. The BASH shell can test to see if one file is newer than another [ a -nt b ]. What you can do then is

  • Set a reference file's times to be the same as your db file times using touch.

Then have a script run once per day that checks if the db file is newer than the reference file.

  • If it is newer then update the reference file's times to be the same as the db file and backup the db file.
  • Otherwise do nothing.

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