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I've been trying to delete the second and third lines from about 50 text files.

I need to keep the headers but delete lines "1" and "2", meaning I need to delete the second and third lines of each text file. I have been trying to use:

sed -i.bak '2,3d' *.txt

But in only deletes the lines from the first file in the folder. How can I get this to apply to all the files in the folder?

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    AFAIK that should have worked since the -i option implies the -s option, meaning that 2,3d should have been applied to each file separately. However if you'd tested it without the -i (and without explicitly adding -s) you would have seen the changes applied only to the first file. – steeldriver Aug 13 at 17:39
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Here are two ways, choice depends on how many files you have, how long the names are, and whether or not the filenames have "funny characters.

for i in *.txt ; do
    sed -i.bak '2,3d' "$i"
done

Or, the complex case:

find . -maxdepth 1 -type f -name '*.txt' -print0 | \
    xargs -0 -r -n 1 sed -i.bak '2,3d'
  • Thank you so much! The first one worked like a charm! – Alexis Dodson Aug 13 at 17:28
  • Then please click the Accept checkmark. – waltinator Aug 13 at 17:51
  • Could you add explanations what these commands do? sed is capable of processing more than one file, so why not just sed -i.bak 2,3d *.txt or find … -exec sed -i.bak 2,3d {} + ? – dessert Aug 13 at 20:31
  • The commands are explained in their man pages. man bash, man sed, man find and man xargs. I see no reason why I should re-document the commands. – waltinator Aug 15 at 13:11

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