(diff.info) Invoking diff
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Invoking `diff'
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The format for running the `diff' command is:
diff OPTIONS... FILES...
In the simplest case, two file names FROM-FILE and TO-FILE are
given, and `diff' compares the contents of FROM-FILE and TO-FILE. A
file name of `-' stands for text read from the standard input. As a
special case, `diff - -' compares a copy of standard input to itself.
If one file is a directory and the other is not, `diff' compares the
file in the directory whose name is that of the non-directory. The
non-directory file must not be `-'.
If two file names are given and both are directories, `diff'
compares corresponding files in both directories, in alphabetical
order; this comparison is not recursive unless the `-r' or
`--recursive' option is given. `diff' never compares the actual
contents of a directory as if it were a file. The file that is fully
specified may not be standard input, because standard input is nameless
and the notion of "file with the same name" does not apply.
If the `--from-file=FILE' option is given, the number of file names
is arbitrary, and FILE is compared to each named file. Similarly, if
the `--to-file=FILE' option is given, each named file is compared to
FILE.
`diff' options begin with `-', so normally file names may not begin
with `-'. However, `--' as an argument by itself treats the remaining
arguments as file names even if they begin with `-'.
An exit status of 0 means no differences were found, 1 means some
differences were found, and 2 means trouble.
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* diff Options Summary of options to `diff'.
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