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Linux command to automate deletion of ‘n’ day old backup or data

Suppose if I want to keep 3 days backup with me and want to delete data before 3 days:

here, ls -lt will sort by newest file at top, print $NF to select name of records and tail -n +4 will output lines starting with the 4th. In this way it will delete records older than 3 days.

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