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#!/bin/bash
firstString="I love Suzi and Marry"
secondString="Sara"
echo "${firstString/Suzi/$secondString}"
# prints 'I love Sara and Marry'
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#1) Open the file in vi or vim
#2) Run the replacement command in vi (or vim) as follows
# Replace all matching patterns
:s%/PatternToReplace/Replacement
# Replace one matching pattern at a time
:s/PatternToReplace/Replacement