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+.\"	$OpenBSD: vis.1,v 1.16 2022/07/30 07:19:31 jsg Exp $
+.\"	$NetBSD: vis.1,v 1.5 1994/11/17 07:56:00 jtc Exp $
+.\"
+.\" 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. 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 $Mdocdate: July 30 2022 $
+.Dt VIS 1
+.Os
+.Sh NAME
+.Nm vis
+.Nd display non-printable characters in a visual format
+.Sh SYNOPSIS
+.Nm vis
+.Op Fl abcflnostw
+.Op Fl F Ar foldwidth
+.Op Ar
+.Sh DESCRIPTION
+.Nm
+is a filter for converting non-printable characters
+into a visual representation.
+It differs from
+.Ic cat -v
+in that
+the form can be unique and invertible.
+By default, all non-printing
+characters except space, tab, and newline are encoded,
+as are any meta-characters
+.Pq eighth bit set .
+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 a
+Encode all characters, whether originally visible or not.
+.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 nor precise, but does
+represent a minimum of change to the input.
+It is similar to
+.Ic 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 Ar foldwidth
+Causes
+.Nm
+to fold output lines to
+.Ar foldwidth
+columns, 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
+Like
+.Fl F ,
+except output is always folded to 80 columns.
+.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
+becomes like
+an invertible version of the
+.Xr fold 1
+utility.
+That is, the output
+can be unfolded by running the output through
+.Xr unvis 1 .
+.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.
+Meta-characters that are considered graphic characters by
+.Xr isgraph 3
+are not encoded.
+.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 appeared in
+.Bx 4.3 Reno .