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VIS(1) OpenBSD Reference Manual VIS(1)
vis - display non-printable characters in a visual format
vis [-cbflnostw] [-F foldwidth] [file ...]
vis is a filter for converting non-printable characters into a visual
representation. It differs from `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 vis(3).
The options are as follows:
-b Turns off prepending of backslash before up-arrow control se-
quences and meta-characters, and disables the doubling of back-
slashes. This produces output which is neither invertible nor
precise, but does represent a minimum of change to the input. It
is similar to ``cat -v''.
-c Request a format which displays a small subset of the non-print-
able characters using C-style backslash sequences.
-F Causes vis to fold output lines to foldwidth columns (default
80), like fold(1), except that a hidden newline sequence is
used, (which is removed when inverting the file back to its orig-
inal form with unvis(1)). If the last character in the encoded
file does not end in a newline, a hidden newline sequence is ap-
pended to the output. This makes the output usable with various
editors and other utilities which typically don't work with par-
-f Same as -F.
-l Mark newlines with the visible sequence `\$', followed by the
-n Turns off any encoding, except for the fact that backslashes are
still doubled and hidden newline sequences inserted if -f or -F
is selected. When combined with the -f flag, vis becomes like an
invertible version of the fold(1) utility. That is, the output
can be unfolded by running the output through unvis(1).
-o Request a format which displays non-printable characters as an
octal number, \ddd.
-s Only characters considered unsafe to send to a terminal are en-
coded. This flag allows backspace, bell, and carriage return in
addition to the default space, tab and newline.
-t Tabs are also encoded.
-w White space (space-tab-newline) is also encoded.
The vis command appeared in 4.4BSD.
OpenBSD 2.6 April 19, 1994 1
Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.
(Corrections, notes, and links courtesy of RocketAware.com)
FreeBSD Sources for vis(1)
OpenBSD sources for vis(1)
Up to: File filtering and processing - Methods of filtering and processing files. (character translation, comparison, search, sort, word counts, etc.)
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