Sed

1. Replace a string in a file with a newstring
2. Find and delete a line
3. Remove empty lines
4. Remove the first or n lines in a file
5. To replace tabs with spaces
6. Show defined lines from a file
7. Substitute within Vim editor
8. And many more

Examples¶

Replace the oldWord with the newWord globally (Only on screen)¶

sed 's/oldWord/newWord/g' fileName

Replace the oldWord with the newWord globally (make changes permanent)¶

sed -i 's/oldWord/newWord/g' fileName

Find and delete the keyWord¶

sed 'keyWord/d' fileName

Delete an empty line from a file

sed '/^$/d' fileName

Delete first line

sed '1d' fileName

Delete first two lines

sed '1,2d' fileName

Replace Tabs with Spaces

sed 's/\t/ /g' fileName

View from line i to j

sed -n i,jp fileName
sed -n 12,18p fileName #view from line 12 to 18

View all except from i to j

sed i,jd fileName

Add space after each line

sed G fileName

Replace oldWord with newWord except the ith occurence

sed 'i!s/oldWord/newWord/g' fileName

Search and replace in the Vim editor

:s/oldWord/newWord