Linux - Delete all but not last n lines, Leave last few lines and delete all

Delete all but not last n lines

How do I delete a huge file except last n lines of a file?

vi editor has a feature called "ex", By using it you can delete all lines of a file except n lines from a file

Create a file with n lines

 # for i in $(seq 1 2500); do echo "$i" >>delete_test ; done

For example the above will create a file called delete_test from 1 to 2500 lines

Delete all lines but not last 500 lines

 # ex -c '1,$-500d' -c 'wq' delete_test

This will delete all the lines excet last 500 lines from the file

The topic on Linux - Delete all but not last n lines is posted by - Maha

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