sed -i 's/original/new/g' file.txt
sed
= Stream EDitor
-i
= in-place (i.e. save back to the original file)
- The command string:
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 (i.e. replace all and not just the first occurrence)
file.txt
= the file name
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