DOT-Files/Gentoo/gentooamd/home/user/.tldrc/tldr/pages/linux/sed.md

sed

GNU stream editor for filtering and transforming text. See also: awk, ed. More information: https://www.gnu.org/software/sed/manual/sed.html.

• [s]ubstitute all occurrences of "apple" with "mango" on all lines, print to stdout:

{{command}} | sed 's/apple/mango/g'

• Replace "apple" with "mango" in-place in a file (overwriting original file):

sed {{[-i|--in-place]}} 's/apple/mango/g' {{path/to/file}}

• Run multiple substitutions in one command:

{{command}} | sed -e '{{s/apple/mango/g}}' -e '{{s/orange/lime/g}}'

• Use a custom delimiter (useful when the pattern contains slashes):

{{command}} | sed '{{s#////#____#g}}'

• [d]elete lines 1 to 5 of a file and back up the original file with a .orig extension:

sed {{[-i|--in-place=]}}.orig '1,5d' {{path/to/file}}

• [p]rint only the first line to stdout:

{{command}} | sed {{[-n|--quiet]}} '1p'

• [i]nsert a new line at the beginning of a file, overwriting the original file:

sed {{[-i|--in-place]}} '1i\your new line text\' {{path/to/file}}

• Delete blank lines (with or without spaces/tabs) from a file, overwriting the original file:

sed {{[-i|--in-place]}} '/^[[:space:]]*$/d' {{path/to/file}}