Getting Started

$ sed 's/old/new/g' file.txt
$ sed 's/old/new/g' file.txt > new.txt
$ sed 's/old/new/g' -i file.txt
$ sed 's/old/new/g' -i.backup file.txt

$ echo 's/h/H/g' >> hello.sed
$ echo 's/w/W/g' >> hello.sed
$ echo "hello world" | sed -f hello.sed
Hello World

Use -f to execute sed script file

$ echo "hello world" | sed -e 's/h/H/g' -e 's/w/W/g'
Hello World

Use -e to execute multiple sed commands

Option	Example	Description
`-i`	sed -ibak 's/On/Off/' php.ini	Backup and modify input file directly
`-E`	sed -E 's/[0-9]+//g' input-file	Use extended regular expressions
`-n`	sed -n '3 p' config.conf	Suppress default pattern space printing
`-f`	sed -f script.sed config.conf	Execute sed script file
`-e`	sed -e 'command1' -e 'command2' input-file	Execute multiple sed commands

Syntax

$ sed [options] command [input-file]

With pipeline

$ cat report.txt | sed 's/Nick/John/g'

$ echo '123abc' | sed 's/[0-9]+//g'

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