# Sed utility

tags
Coding

## In-place batch file manipulation

### Delete the same line in many files

Let’s start by creating a simple text file with three lines. This is what it looks like:

echo "Hello\nto the\nworld" > test.txt
cat test.txt

Hello
to the
world


We use sed to remove lines in the file matching some regex. The -i.bak option ensures the file is modified in place.

sed -i.bak '/to the/d' test.txt
cat test.txt

Hello
world


We get the file with the removed line in place of our original file. The same principle applies to several files and this allows batching.