sed -i 's/original/new/g' file.txt |
Where
- sed means Stream EDitor
- -i – in-place (for example save back to the original file)
- s – the substitute command
- original – a regular expression describing the word to replace (or just the word itself)
- new – the text to replace it with
- g – global (replace all and not just the first occurrence)
- myfile.txt – the file name