cheat/cheatsheets/sed

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To replace all occurrences of "day" with "night" and write to stdout:
sed 's/day/night/g' file.txt
To replace all occurrences of "day" with "night" within file.txt:
sed -i 's/day/night/g' file.txt
To replace all occurrences of "day" with "night" on stdin:
echo 'It is daytime' | sed 's/day/night/g'