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-.\" Copyright (c) 1989, 1991, 1993, 1994
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 4. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)vis.1	8.4 (Berkeley) 4/19/94
-.\"
-.Dd April 19, 1994
-.Dt VIS 1
-.Os BSD 4.4
-.Sh NAME
-.Nm vis
-.Nd display non-printable characters in a visual format
-.Sh SYNOPSIS
-.Nm vis
-.Op Fl cbflnostw
-.Op Fl F Ar foldwidth
-.Op Ar file ...
-.Sh DESCRIPTION
-.Nm Vis
-is a filter for converting non-printable characters
-into a visual representation.  It differs from
-.Ql cat -v
-in that
-the form is unique and invertible.  By default, all non-graphic
-characters except space, tab, and newline are encoded.
-A detailed description of the
-various visual formats is given in
-.Xr vis 3 .
-.Pp
-The options are as follows:
-.Bl -tag -width Ds
-.It Fl b
-Turns off prepending of backslash before up-arrow control sequences
-and meta characters, and disables the doubling of backslashes.  This
-produces output which is neither invertible or precise, but does
-represent a minimum of change to the input.  It is similar to
-.Dq Li cat -v .
-.It Fl c
-Request a format which displays a small subset of the
-non-printable characters using C-style backslash sequences.
-.It Fl F
-Causes
-.Nm vis
-to fold output lines to foldwidth columns (default 80), like
-.Xr fold 1 ,
-except
-that a hidden newline sequence is used, (which is removed
-when inverting the file back to its original form with
-.Xr unvis 1 ) .
-If the last character in the encoded file does not end in a newline,
-a hidden newline sequence is appended to the output.
-This makes
-the output usable with various editors and other utilities which
-typically don't work with partial lines.
-.It Fl f
-Same as
-.Fl F .
-.It Fl l
-Mark newlines with the visible sequence
-.Ql \e$ ,
-followed by the newline.
-.It Fl n
-Turns off any encoding, except for the fact that backslashes are
-still doubled and hidden newline sequences inserted if
-.Fl f
-or
-.Fl F
-is selected.  When combined with the
-.Fl f
-flag,
-.Nm vis
-becomes like
-an invertible version of the
-.Xr fold 1
-utility.  That is, the output
-can be unfolded by running the output through
-.It Fl o
-Request a format which displays non-printable characters as
-an octal number, \eddd.
-.It Fl s
-Only characters considered unsafe to send to a terminal are encoded.
-This flag allows backspace, bell, and carriage return in addition
-to the default space, tab and newline.
-.Xr unvis 1 .
-.It Fl t
-Tabs are also encoded.
-.It Fl w
-White space (space-tab-newline) is also encoded.
-.El
-.Sh SEE ALSO
-.Xr unvis 1 ,
-.Xr vis 3
-.Sh HISTORY
-The
-.Nm
-command appears in
-.Bx 4.4 .