How to save text file after use cat -n command

Asked Mar 24 '20 at 15:38

Active Mar 24 '20 at 15:38

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I am created file use "cat > sample.txt". after i used "cat -b sample.txt". how to save it. ctrl+x or F2 is not working.cat -b command

asked Mar 24 '20 at 15:38

TipVisor

What do you mean "save it"? Do you want the line numbers to go into the actual file? If yes, why? – glenn jackman Mar 24 '20 at 15:41
yes. i want to know to my knowledge. – TipVisor Mar 24 '20 at 16:30
Beware that cat -b sample.txt > sample.txt will not work. In fact it will destroy the file. That's because bash will process the redirection first (truncating the file to zero bytes) before launching the cat command. – glenn jackman Mar 24 '20 at 16:37
You can cat -b sample.txt > tempfile && mv tempfile sample.txt – glenn jackman Mar 24 '20 at 16:38
Or install the moreutils package and cat -b sample.txt | sponge sample.txt – glenn jackman Mar 24 '20 at 16:42
This command is working correctly. Thank you. cat -b sample.txt > tempfile && mv tempfile sample.txt – TipVisor Mar 25 '20 at 03:15

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