nepsilon/how-to-append-line-numbers-in-front-of-each-line-in-a-file.md

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How to append line numbers in front of each line in a file? — First published in fullweb.io issue #86

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how-to-append-line-numbers-in-front-of-each-line-in-a-file.md

How to append line numbers in front of each line in a file?

Just use cat. No kidding, cat has the -n option to number the output lines, starting at 1:

cat -n file.txt

This works well both on Linux and Mac. Use the shell redirection to keep the output in a new file (don’t override the original file with the redirection though).