Text processing

Linux sed command

Transform text streams; this example prints matching lines without editing files.

Availability: Common Linux commands; shell built-ins and external implementations may differ by distribution.中文

Syntax

sed [OPTION]... SCRIPT [FILE]...

Examples

Print lines 1 to 20 without printing other lines.

sed -n '1,20p' app.log

Replace every old occurrence on each line in the output.

sed 's/old/new/g' names.txt

Parameters, options and clauses

Option / clause	Description
`-n, --quiet`	Suppress automatic printing; use p to print selected lines.
`-E, -r, --regexp-extended`	Use extended regular expressions.
`-e SCRIPT`	Add a script to the commands to be executed.
`-f FILE`	Read editing commands from FILE.
`-i[SUFFIX], --in-place`	Edit files in place; an optional suffix keeps a backup.
`-z, --null-data`	Separate input records with NUL characters.

Safety note

Review a command and its target before running it. Commands that alter files, services, accounts, disks, permissions or databases may be difficult to reverse. Test in a safe environment and keep backups.

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