sed

sed

Stream editor. Filter text in a pipeline.

Examples:

sed "1,32 d" file.txt

Delete lines 1 through 32

sed 's/[ ^t]*$//' file.txt

Delete trailing whitespace (spaces/tabs) from end of each line.

Delete both leading and trailing whitespace from each line.

sed 's/^[ ^t]*//;s/[ ^t]*$//' file.txt

sed 's/foo/bar/g' file.txt

Replace all instances of "foo" with "bar".

sed '/^Delete/d' file.txt

Delete lines starting with "Delete".

sed --in-place 's/^\(.\{20\}\).*/\1/g' file

Replace all lines with only their first 20 characters.