Annotation of src/usr.bin/vis/vis.1, Revision 1.13
1.13 ! sobrado 1: .\" $OpenBSD: vis.1,v 1.12 2007/05/31 19:20:19 jmc Exp $
1.1 deraadt 2: .\" $NetBSD: vis.1,v 1.5 1994/11/17 07:56:00 jtc Exp $
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31: .\" @(#)vis.1 8.4 (Berkeley) 4/19/94
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1.13 ! sobrado 33: .Dd $Mdocdate: May 31 2007 $
1.1 deraadt 34: .Dt VIS 1
1.5 aaron 35: .Os
1.1 deraadt 36: .Sh NAME
37: .Nm vis
38: .Nd display non-printable characters in a visual format
39: .Sh SYNOPSIS
40: .Nm vis
1.11 jmc 41: .Op Fl bcflnostw
1.10 jmc 42: .Op Fl F Ar foldwidth
1.13 ! sobrado 43: .Op Ar
1.1 deraadt 44: .Sh DESCRIPTION
1.6 aaron 45: .Nm
1.1 deraadt 46: is a filter for converting non-printable characters
1.6 aaron 47: into a visual representation.
48: It differs from
49: .Ic cat -v
1.1 deraadt 50: in that
1.7 pjanzen 51: the form can be unique and invertible.
52: By default, all non-printing
53: characters except space, tab, and newline are encoded,
54: as are any meta-characters
55: .Pq eighth bit set .
1.1 deraadt 56: A detailed description of the
57: various visual formats is given in
58: .Xr vis 3 .
59: .Pp
60: The options are as follows:
61: .Bl -tag -width Ds
62: .It Fl b
63: Turns off prepending of backslash before up-arrow control sequences
1.6 aaron 64: and meta-characters, and disables the doubling of backslashes.
65: This produces output which is neither invertible nor precise, but does
66: represent a minimum of change to the input.
67: It is similar to
68: .Ic cat -v .
1.1 deraadt 69: .It Fl c
70: Request a format which displays a small subset of the
71: non-printable characters using C-style backslash sequences.
1.10 jmc 72: .It Fl F Ar foldwidth
1.1 deraadt 73: Causes
1.6 aaron 74: .Nm
1.9 avsm 75: to fold output lines to
76: .Ar foldwidth
1.10 jmc 77: columns, like
1.1 deraadt 78: .Xr fold 1 ,
79: except
80: that a hidden newline sequence is used, (which is removed
81: when inverting the file back to its original form with
82: .Xr unvis 1 ) .
83: If the last character in the encoded file does not end in a newline,
84: a hidden newline sequence is appended to the output.
85: This makes
86: the output usable with various editors and other utilities which
87: typically don't work with partial lines.
88: .It Fl f
1.10 jmc 89: Like
90: .Fl F ,
91: except output is always folded to 80 columns.
1.1 deraadt 92: .It Fl l
93: Mark newlines with the visible sequence
94: .Ql \e$ ,
95: followed by the newline.
96: .It Fl n
97: Turns off any encoding, except for the fact that backslashes are
98: still doubled and hidden newline sequences inserted if
99: .Fl f
100: or
101: .Fl F
1.6 aaron 102: is selected.
103: When combined with the
1.1 deraadt 104: .Fl f
105: flag,
1.6 aaron 106: .Nm
1.1 deraadt 107: becomes like
108: an invertible version of the
109: .Xr fold 1
1.6 aaron 110: utility.
111: That is, the output
1.4 aaron 112: can be unfolded by running the output through
113: .Xr unvis 1 .
1.1 deraadt 114: .It Fl o
115: Request a format which displays non-printable characters as
116: an octal number, \eddd.
117: .It Fl s
118: Only characters considered unsafe to send to a terminal are encoded.
119: This flag allows backspace, bell, and carriage return in addition
1.7 pjanzen 120: to the default space, tab, and newline.
121: Meta-characters that are considered graphic characters by
122: .Xr isgraph 3
123: are not encoded.
1.1 deraadt 124: .It Fl t
125: Tabs are also encoded.
126: .It Fl w
127: White space (space-tab-newline) is also encoded.
128: .El
129: .Sh SEE ALSO
130: .Xr unvis 1 ,
131: .Xr vis 3
132: .Sh HISTORY
133: The
134: .Nm
1.3 aaron 135: command appeared in
1.1 deraadt 136: .Bx 4.4 .