cat - concatenate files
cat [-] [file...]
The cat command reads each file in sequence and writes it on the standard output. Thus
prints a file and
cat file1 file2 >file3
concatenates the first two files and places the result on the third. If no file is given, or if minus (-) is given as an argument cat reads from the standard input.
Beware of cat a b >a and cat a b >b which destroy input files before reading them.
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