inv man page on HP-UX

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vis(1)									vis(1)

       vis,  inv - make unprintable and non-ASCII characters in a file visible
       or invisible

       file ...

       file ...

       reads characters from each file in sequence  and	 writes	 them  to  the
       standard	 output,  converting those that are not printable or not ASCII
       into a visible form.  inv performs the inverse function, reading print‐
       able characters from each file, returning them to non-printable or non-
       ASCII form, if appropriate, then writing them to standard output;

       Non-printable ASCII characters are represented using C-like escape con‐
	      carriage return
	      horizontal tab
	      vertical tab
	      the character whose
		      ASCII code is the 3-digit octal number n.
	      the character whose
		      ASCII code is the 2-digit hexadecimal number n.

       Non-ASCII  single-  or multi-byte characters are examined one byte at a
       time.  For each byte, if it can be displayed as an ASCII character,  it
       is treated as if it is an ASCII character; Otherwise, it is represented
       in the following conventions:
	      the 8-bit character whose
		      code value is the 3-digit octal number n.
	      the 8-bit character whose
		      code value is the 2-digit hexadecimal number n.

       Space, horizontal-tab, and new-line characters can be treated as print‐
       able  (and  therefore  passed unaltered to the output) or non-printable
       depending on the options selected.  Backslash, although	printable,  is
       expanded	 by vis, to a pair of backslashes so that when they are passed
       back through inv, they convert back to a single backslash.

       If no input file is given, or if the argument is encountered,  and  inv
       read from the standard input.

       and recognize the following options:

	      Treat new-line, space, and horizontal tab as non-printable char‐
		      expands them visibly as and  rather  than	 passing  them
		      directly	to  the	 output.   discards  these characters,
		      expecting only the printable expansions.	New-line char‐
		      acters are inserted by every 16 bytes so that the output
		      will be in a form that is usable by most editors.

	      Make    and silent about non-existent files, identical input and
		      output,  and  write errors.  Normally, no input file can
		      be the same as the output file unless it	is  a  special

	      Treat horizontal-tab and space characters as non-printable
		      in the same manner that treats them.

	      Cause output to be unbuffered (byte-by-byte);
		      normally, output is buffered.

	      Cause   output to be in hexadecimal form rather than the default
		      octal form.  Either form is accepted to as input.

   Environment Variables
       determines the language in which messages are displayed.

   International Code Set Support
       Single- and multi-byte character code sets are supported.

       Redirecting output to an input file destroys the original data.	There‐
       fore, command forms such as

       should be avoided unless the source file can be safely discarded.

       was developed by HP.

       cat(1), echo(1), od(1).


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