The diff command is used to compare different
revisions of files. The default action is to compare
your working files with the revisions they were based
on, and report any differences that are found.
If any file names are given, only those files are compared. If any directories are given, all files under them will be compared.
The exit status will be 0 if no differences were found, 1 if some differences were found, and 2 if any error occurred.
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