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3.1 `cat': Concatenate and write files

`cat' copies each FILE (`-' means standard input), or standard input if
none are given, to standard output.  Synopsis:

     cat [OPTION] [FILE]...

   The program accepts the following options.  Also see *note Common

     Equivalent to `-vET'.

     Number all nonempty output lines, starting with 1.

     Equivalent to `-vE'.

     Display a `$' after the end of each line.

     Number all output lines, starting with 1.

     Suppress repeated adjacent empty lines; output just one empty line
     instead of several.

     Equivalent to `-vT'.

     Display TAB characters as `^I'.

     Ignored; for POSIX compatibility.

     Display control characters except for LFD and TAB using `^'
     notation and precede characters that have the high bit set with

   On systems like MS-DOS that distinguish between text and binary
files, `cat' normally reads and writes in binary mode.  However, `cat'
reads in text mode if one of the options `-bensAE' is used or if `cat'
is reading from standard input and standard input is a terminal.
Similarly, `cat' writes in text mode if one of the options `-bensAE' is
used or if standard output is a terminal.

   An exit status of zero indicates success, and a nonzero value
indicates failure.


     # Output f's contents, then standard input, then g's contents.
     cat f - g

     # Copy standard input to standard output.