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diff --git a/contrib/vis/vis.1 b/contrib/vis/vis.1 new file mode 100644 index 0000000..1b0b5edf --- /dev/null +++ b/contrib/vis/vis.1 @@ -0,0 +1,169 @@ +.\" $NetBSD: vis.1,v 1.17 2013/02/14 14:00:00 christos 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 February 13, 2013 +.Dt VIS 1 +.Os +.Sh NAME +.Nm vis +.Nd display non-printable characters in a visual format +.Sh SYNOPSIS +.Nm +.Op Fl bcfhlmnostw +.Op Fl e Ar extra +.Op Fl F Ar foldwidth +.Op Ar file ... +.Sh DESCRIPTION +.Nm +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 . +.Pq Dv VIS_NOSLASH +.It Fl c +Request a format which displays a small subset of the +non-printable characters using C-style backslash sequences. +.Pq Dv VIS_CSTYLE +.It Fl e Ar extra +Also encode characters in +.Ar extra , +per +.Xr svis 3 . +.It Fl F Ar foldwidth +Causes +.Nm +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 h +Encode using the URI encoding from RFC 1808. +.Pq Dv VIS_HTTPSTYLE +.It Fl l +Mark newlines with the visible sequence +.Ql \e$ , +followed by the newline. +.It Fl m +Encode using the MIME Quoted-Printable encoding from RFC 2045. +.Pq Dv VIS_MIMESTYLE +.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. +.Pq Dv VIS_OCTAL +.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. +.Pq Dv VIS_SAFE +.It Fl t +Tabs are also encoded. +.Pq Dv VIS_TAB +.It Fl w +White space (space-tab-newline) is also encoded. +.Pq Dv VIS_WHITE +.El +.Sh MULTIBYTE CHARACTER SUPPORT +.Nm +supports multibyte character input. +The encoding conversion is influenced by the setting of the +.Ev LC_CTYPE +environment variable which defines the set of characters that can be +copied without encoding. +.Pp +When 8-bit data is present in the input, +.Ev LC_CTYPE +must be set to the correct locale or to the C locale. +If the locales of the data and the conversion are mismatched, multibyte +character recognition may fail and encoding will be performed byte-by-byte +instead. +.Sh ENVIRONMENT +.Bl -tag -width ".Ev LC_CTYPE" +.It Ev LC_CTYPE +Specify the locale of the input data. +Set to C if the input data locale is unknown. +.Sh SEE ALSO +.Xr unvis 1 , +.Xr svis 3 , +.Xr vis 3 +.Sh HISTORY +The +.Nm +command appears in +.Bx 4.4 . +Myltibyte character support was added in +.Nx 6.1 +and +.Fx 9.2 . |
