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sed
Sed
Sed is a very useful program that often is used as a filter in shell scripts.
From the sed man page:
Sed is a stream editor. A stream editor is used to perform basic text transformations on an input stream (a file or input from a pipeline).
Simple find-and-replace in text file
To replace all occurrences of the string findme and replace it with the string replcaceme in a file named test.file using sed just use the follwing command.
sed -e 's/findme/replaceme/g' test.fil > newtest.fil
