(coreutils.info.gz) base64 invocation

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 3.5 'base64': Transform data into printable data
 ================================================
 
 'base64' transforms data read from a file, or standard input, into (or
 from) base64 encoded form.  The base64 encoded form uses printable ASCII
 characters to represent binary data.  Synopses:
 
      base64 [OPTION]... [FILE]
      base64 --decode [OPTION]... [FILE]
 
    The base64 encoding expands data to roughly 133% of the original.
 The format conforms to RFC 4648
 (ftp://ftp.rfc-editor.org/in-notes/rfc4648.txt).
 
    The program accepts the following options.  Also see  Common
 options.
 
 '-w COLS'
 '--wrap=COLS'
      During encoding, wrap lines after COLS characters.  This must be a
      positive number.
 
      The default is to wrap after 76 characters.  Use the value 0 to
      disable line wrapping altogether.
 
 '-d'
 '--decode'
      Change the mode of operation, from the default of encoding data, to
      decoding data.  Input is expected to be base64 encoded data, and
      the output will be the original data.
 
 '-i'
 '--ignore-garbage'
      When decoding, newlines are always accepted.  During decoding,
      ignore unrecognized bytes, to permit distorted data to be decoded.
 
    An exit status of zero indicates success, and a nonzero value
 indicates failure.
 

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