Sed text processing and stream editor

Basic

Replace

sed -i 's/before/after/' file

Execute multiple commands in the same line

sed -i -e '' -e '' file

Value

sed -i 's/'$value'/after/' file

Save

sed -i 's/abc\(def\)/ghi/' file # ghidef
sed -i 's/abc\(def\)/\1/' file # defdef
sed -i 's/abc.*/[&]/' file # [abc.*]

Delete

sed -i '1,$d' file # remove 1-end line
sed -i 's/abc//' file # delete all abc