Prepend a text to a file.

echo "text to prepend" | cat - file
Prepend text to a file. It doen't need temporary files, ed or sed.

0
By: leni536
2013-12-18 15:54:17

4 Alternatives + Submit Alt

What Others Think

This does not prepend to the file. It only prints it out before printing out the file. The original file is unchanged. It's no better than running this: echo "text to prepend";cat file
tlemerond · 320 weeks and 4 days ago
If you want to use the original and actually modify the file: echo "text to prepend" | cat - file > file
tlemerond · 320 weeks and 4 days ago
My bad, you can't use the same input and output file with cat. Best to use sed with the -i option.
tlemerond · 320 weeks and 4 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

You must be signed in to comment.

What's this?

commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands



Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.

» http://twitter.com/commandlinefu
» http://twitter.com/commandlinefu3
» http://twitter.com/commandlinefu10

Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: