Sed Cheat Sheet
This page contain a complete list of Sed cheat sheet
| 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. |