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I want to delete one or more specific line numbers from a file. How would I do this using sed?

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To delete lines 2, 12-17 and line 57 from file data.txt using sed you could do something like this:

 sed -e '2d;12,17d;57d' data.txt

to create a backup of the original file (with a .bak extension) use -i.bak with the command.

 sed -i.bak -e '2d;12,17d;57d' data.txt

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