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`sed` command is one of the ways to do replacement task. This command can be used to replace text in a string or a file by using a different pattern.
Replacing or substituting string : Sed command is mostly used to replace the text in a file.
Find and replace text within a file using sed command Use Stream EDitor (sed) as follows: sed -i 's/old-text/new-text/g' input.txt. The s is the substitute command of sed for find and replace. It tells sed to find all occurrences of 'old-text' and replace with 'new-text' in a file named input.txt.
You just need to negate the match using !:
sed -i '/^##Input/! s/foo/bar/g' myfile
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