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cat
Print and concatenate files.
Examples
Print the contents of a file to `stdout` GNU
Concatenate several files into an output file GNU
Append several files to an output file GNU
Write to a file interactively GNU
Number all output lines GNU
Display all characters, including tabs, line endings, and non-printing characters GNU
Pass file contents to another program through `stdin` GNU
Print the contents of a file to `stdout`
Concatenate several files into an output file
Append several files to an output file
Copy the contents of a file into an output file without buffering
Write `stdin` to a file