cat
synopsis : cat [OPTION]… [FILE]…
description: concatenate files and print on the standard output
tac
synopsis : tac [OPTION]… [FILE]…
description: concatenate and print files in reverse
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cmp
synopsis : cmp [-c] [-i N] [-l] [-s] [-v] file1 file2
description: compare two files
diff
synopsis : diff [-b] [-i] [-t] [-w] [-c] [-C] [-e] [...]

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