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 commandoriginal = a regular expression describing the word to replace (or just the word itself)new = the text to replace it withg = global (i.e. replace all and not just the first occurrence)
file.txt = the file name
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