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March 2, 2025 20:59
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Save emanuele6/d846879d025fbbac674b676df6682b70 to your computer and use it in GitHub Desktop.
POSIX ed script that prepends line numbers to the lines of a file.
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| 1s/^/1 / | |
| 2,$g/^/-t -\ | |
| s/ .*//\ | |
| s/^9*$/0&/\ | |
| t .\ | |
| s/^.*[^9]\(9*\)$/\1 /\ | |
| s/9/0/g\ | |
| -s/9*$//\ | |
| s/8$/9/\ | |
| s/7$/8/\ | |
| s/6$/7/\ | |
| s/5$/6/\ | |
| s/4$/5/\ | |
| s/3$/4/\ | |
| s/2$/3/\ | |
| s/1$/2/\ | |
| s/0$/1/\ | |
| .,+2j | |
| w | |
| q |
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Thanks a lot, this is genius. I love it.
Thank you for the script and for the explanation.
i couldn't understand it specifically because of the 9 replaced by 0 part and copying another line and the effect it had in the incrementation process.