cheat/cheatsheets/sed

# To replace all occurrences of "day" with "night" and write to stdout:
sed s/day/night file.txt

# To replace all occurrences of "day" with "night" within file.txt:
sed s/day/night file.txt > file.txt

# To replace all occurrences of "day" with "night" on stdin:
echo 'It is daytime' | sed s/day/night/