delete lines using awk

Here’s how to delete a line from a file using awk.

awk '!/Redhat/' sample.txt > sample.tmp && mv sample.tmp sample.txt

The command above looks for ‘Redhat’ in a file and removes that line from the file.

You can add the line in the crontab to run at reboot if you like.

crontab -e

@reboot awk '!/Redhat/' sample.txt > sample.tmp && mv sample.tmp sample.txt