Useful Linux Command

How to search and replace a word in file in Linux?

sed -i 's/original/new/g' file.txt

Explanation:

• 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