Info Catalog coreutils: cat invocation coreutils: Output of entire files coreutils: nl invocation

coreutils: tac invocation

 
 3.2 ‘tac’: Concatenate and write files in reverse
 =================================================
 
 ‘tac’ copies each FILE (‘-’ means standard input), or standard input if
 none are given, to standard output, reversing the records (lines by
 default) in each separately.  Synopsis:
 
      tac [OPTION]... [FILE]...
 
    “Records” are separated by instances of a string (newline by
 default).  By default, this separator string is attached to the end of
 the record that it follows in the file.
 
    The program accepts the following options.  Also see ⇒Common
 options.
 
 ‘-b’
 ‘--before’
      The separator is attached to the beginning of the record that it
      precedes in the file.
 
 ‘-r’
 ‘--regex’
      Treat the separator string as a regular expression.
 
 ‘-s SEPARATOR’
 ‘--separator=SEPARATOR’
      Use SEPARATOR as the record separator, instead of newline.  Note an
      empty SEPARATOR is treated as a zero byte.  I.e., input and output
      items are delimited with ASCII NUL.
 
    On systems like MS-DOS that distinguish between text and binary
 files, ‘tac’ reads and writes in binary mode.
 
    An exit status of zero indicates success, and a nonzero value
 indicates failure.
 
    Example:
 
      # Reverse a file character by character.
      tac -r -s 'x\|[^x]'
 

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