Annotation of src/usr.bin/vis/vis.1, Revision 1.14
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31: .\" @(#)vis.1 8.4 (Berkeley) 4/19/94
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1.14 ! djm 33: .Dd $Mdocdate: August 16 2009 $
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
1.14 ! djm 41: .Op Fl abcfhlnostw
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
1.14 ! djm 62: .It Fl a
! 63: Encode all characters, whether originally visible or not.
1.1 deraadt 64: .It Fl b
65: Turns off prepending of backslash before up-arrow control sequences
1.6 aaron 66: and meta-characters, and disables the doubling of backslashes.
67: This produces output which is neither invertible nor precise, but does
68: represent a minimum of change to the input.
69: It is similar to
70: .Ic cat -v .
1.1 deraadt 71: .It Fl c
72: Request a format which displays a small subset of the
73: non-printable characters using C-style backslash sequences.
1.10 jmc 74: .It Fl F Ar foldwidth
1.1 deraadt 75: Causes
1.6 aaron 76: .Nm
1.9 avsm 77: to fold output lines to
78: .Ar foldwidth
1.10 jmc 79: columns, like
1.1 deraadt 80: .Xr fold 1 ,
81: except
82: that a hidden newline sequence is used, (which is removed
83: when inverting the file back to its original form with
84: .Xr unvis 1 ) .
85: If the last character in the encoded file does not end in a newline,
86: a hidden newline sequence is appended to the output.
87: This makes
88: the output usable with various editors and other utilities which
89: typically don't work with partial lines.
90: .It Fl f
1.10 jmc 91: Like
92: .Fl F ,
93: except output is always folded to 80 columns.
1.14 ! djm 94: .It Fl h
! 95: Request a format which displays non-printable characters as
! 96: a hexadecimal number, \exdd.
1.1 deraadt 97: .It Fl l
98: Mark newlines with the visible sequence
99: .Ql \e$ ,
100: followed by the newline.
101: .It Fl n
102: Turns off any encoding, except for the fact that backslashes are
103: still doubled and hidden newline sequences inserted if
104: .Fl f
105: or
106: .Fl F
1.6 aaron 107: is selected.
108: When combined with the
1.1 deraadt 109: .Fl f
110: flag,
1.6 aaron 111: .Nm
1.1 deraadt 112: becomes like
113: an invertible version of the
114: .Xr fold 1
1.6 aaron 115: utility.
116: That is, the output
1.4 aaron 117: can be unfolded by running the output through
118: .Xr unvis 1 .
1.1 deraadt 119: .It Fl o
120: Request a format which displays non-printable characters as
121: an octal number, \eddd.
122: .It Fl s
123: Only characters considered unsafe to send to a terminal are encoded.
124: This flag allows backspace, bell, and carriage return in addition
1.7 pjanzen 125: to the default space, tab, and newline.
126: Meta-characters that are considered graphic characters by
127: .Xr isgraph 3
128: are not encoded.
1.1 deraadt 129: .It Fl t
130: Tabs are also encoded.
131: .It Fl w
132: White space (space-tab-newline) is also encoded.
133: .El
134: .Sh SEE ALSO
135: .Xr unvis 1 ,
136: .Xr vis 3
137: .Sh HISTORY
138: The
139: .Nm
1.3 aaron 140: command appeared in
1.1 deraadt 141: .Bx 4.4 .
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