Sed Cheat Sheet

This page contain a complete list of Sed cheat sheet

Sed Cheatsheet

Command	Description
`!command`	Run a shell command on the pattern space.
`/#/d`	Delete lines containing a hash symbol.
`/pattern/!d`	Delete lines not matching the pattern.
`1,3d`	Delete lines 1 to 3.
`1,3s/old/new/g`	Substitute globally on lines 1 to 3.
`2p`	Print the second line.
`5!p`	Print lines not matching the address 5.
`5,$d`	Delete from line 5 to the end.
`a\`	Append text after a line.
`D`	Delete up to the first newline in the pattern space.
`G`	Append hold space to pattern space.
`g`	Globally substitute on all matches.
`H`	Append pattern space to hold space.
`h`	Copy pattern space to hold space.
`i\`	Insert text before a line.
`l`	Display non-printing characters.
`N`	Append the next line to the pattern space.
`p`	Print the current line.
`P`	Print up to the first newline in the pattern space.
`q`	Quit (exit) after the first match.
`q`	Quit (exit) without processing further.
`r file.txt`	Read and insert the contents of a file.
`s/[[:space:]]*$//`	Trim trailing whitespace.
`s/[^,]\+,$[^,]\+$,[^,]\+/\1/g`	Extract the second field in a comma-separated list.
`s/[^0-9]$[0-9]\+$[^0-9]/\1/g`	Extract numbers from a string.
`s/[^0-9]//g`	Remove non-numeric characters.
`s/[^aeiou]$[aeiou]$[^aeiou]/\1/g`	Extract and concatenate vowels.
`s/[^aeiou]//g`	Delete all consonants.
`s/$.$,$.$/\2 \1/`	Swap two comma-separated fields.
`s/$.*$/\L\1/;s/./\U&/`	Lowercase the entire line, then uppercase the first letter.
`s/$.*$/\L\1/`	Lowercase the entire line.
`s/$.*$/\L\1\E/`	Uppercase the first letter in each word.
`s/$.*$/\U\1/;s/[^A-Z]/ /g`	Uppercase and replace non-alphabetic characters with spaces.
`s/$.*$/\U\1/;s/[^A-Z]//g`	Uppercase and remove non-alphabetic characters.
`s/$.*$/\U\1/`	Uppercase the entire line.
`s/$.$$[aeiou]$$.$/\1\3\2/`	Swap the first vowel with the last.
`s/$.$\n$.$/\2\1/`	Swap lines in a pattern space.
`s/$.$/\1 /g`	Add a space between each character.
`s/$.$/\1\1/g`	Duplicate each character.
`s/$.$/\1\n/g`	Insert a newline after each character.
`s/$.$/\L\1/g`	Lowercase the entire line.
`s/$.$/\L\1\E/g`	Uppercase the first letter, lowercase the rest.
`s/$.$/\U\1/g`	Uppercase the entire line.
`s/$.$/\U\1\E/g`	Uppercase the first letter, lowercase the rest.
`s/$.$$.*$/\1/g`	Keep only the first character of each line.
`s/$.$$.*$/\2\1/g`	Reverse the characters in each line.
`s/$.$$.*$/\U\1\L\2/`	Capitalize the first letter of a sentence.
`s/$.$$.*$\1/\2/g`	Remove duplicate characters.
`s/$.$$.*$\1/\U\1\L\2/g`	Title Case: Uppercase the first letter of each word.
`s/$[0-9]$/\1 & \1/g`	Surround each digit with spaces.
`s/$[0-9]$/\1\1/`	Duplicate each digit.
`s/$[aeiou]$//g`	Delete all vowels.
`s/$[aeiou]$/\1/g`	Remove duplicate vowels.
`s/$[aeiou]$/\1\1/g`	Duplicate each vowel.
`s/$[aeiou]$/\1\n/g`	Insert a newline after each vowel.
`s/$[aeiou]$/\L\1/g;s/$.$/\U&/`	Uppercase the entire line, then lowercase the first letter.
`s/$[aeiou]$/\L\1/g`	Lowercase all vowels.
`s/$[aeiou]$/\L\1/g`	Lowercase the first vowel in each word.
`s/$[aeiou]$/\U\1/g;s/$.$/\1 /g`	Uppercase vowels and add a space between each character.
`s/$[aeiou]$/\U\1/g`	Uppercase all vowels.
`s/$[aeiou]$/\U\1\E/g`	Uppercase the first vowel in each word.
`s/$[aeiou]$$[aeiou]$/\2\1/g`	Swap adjacent vowels.
`s/$pattern$/\1/g`	Backreference: substitute with matched pattern.
`s/\<[0-9]\+\>//g`	Remove whole numbers.
`s/\bword\b//g`	Delete whole words.
`s/\bword\b/replace/`	Match whole word only.
`s/\n/ /`	Replace newline with space.
`s/^/# /`	Comment out lines by adding a `#` at the beginning.
`s/^[[:space:]]//;s/[[:space:]]$//`	Trim leading and trailing whitespace.
`s/^[[:space:]]*//`	Trim leading whitespace.
`s/^[^#].*$/# &/`	Comment out non-comment lines.
`s/^$.$/\L\1/`	Lowercase the first character.
`s/^$.$/\U\1/`	Uppercase the first character.
`s/^$.$$.*$/\1\U\2/`	Uppercase the second character.
`s/^$.$$.*$/\U\1\L\2/`	Capitalize the first letter of each word.
`s/^start/replace/`	Substitute at the beginning of a line.
`s/end$/replace/`	Substitute at the end of a line.
`s/old//`	Delete instances of old on the current line.
`s/old/new/2`	Substitute on the second occurrence of old.
`s/old/new/`	Substitute old with new on the current line.
`s/old/new/g`	Substitute globally on the current line.
`s/old/new/i`	Case-insensitive substitution.
`s/old/new/p`	Print the line after substitution.
`w output.txt`	Write the pattern space to a file.
`x`	Exchange pattern and hold space.
`y/abc/123/`	Replace characters a, b, c with 1, 2, 3.