Citation :
A pair of lines is compared as follows: `sort' compares each pair of
fields, in the order specified on the command line, according to the
associated ordering options, until a difference is found or no fields
are left. If no key fields are specified, `sort' uses a default key of
the entire line. Finally, as a last resort when all keys compare
equal, `sort' compares entire lines as if no ordering options other
than `--reverse' (`-r') were specified. The `--stable' (`-s') option
disables this "last-resort comparison" so that lines in which all
fields compare equal are left in their original relative order. The
`--unique' (`-u') option also disables the last-resort comparison.
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