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Introduction to GNU/Linux
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Stream editor. Filter text in a pipeline.


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.

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