sed 🖊️

Edits streams by applying commonly used modifications.

Replace substring s

cat some-file.txt | sed 's/me/you/g'

Replaces all occurrences of “me” with “you”.

Replace pattern s

echo "about\nabuse\namount" | sed 's/a\(\w*\?\)\w/\1/g'

bou
bus
moun

\1 refers to the first captured group.

Transform to lowercase \L

echo "HELLO THERE\nHI THERE\nGOODBYE" | sed 's/H\w*/\L&/g'

hello There
hi There
GOODBYE
  • Transforms words beginning with “H” to lowercase.
  • & is the place holder for “entire match”.

Transform to uppercase \U

cat some-file.txt | sed 's/.*/\U&/g'

Transforms all letters into uppercase.

About Living in the Shell
Obsessed with doing things in the shell, I’ve decided to share my daily struggles on living in the shell as terse but informative posts.