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what is the command for comparing two folders, if there were two folders that might be contain same files so I want to know what file is not the same. Maybe the purpose just like diff command.
Thanks in advance,
diff - find differences between two files
diff [options] from-file to-file
In the simplest case, diff compares the contents of the two files 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 from-file is a directory and to-file is not, diff compares the file in from-
file whose file name is that of to-file, and vice versa. The non-directory file
must not be -.
If both from-file and to-file 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.