02-08-2020
You mean the extra line?
I guess there is a space character after the server3; this extra space is converted to an extra newline.
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VIS(1) BSD General Commands Manual VIS(1)
NAME
vis -- display non-printable characters in a visual format
SYNOPSIS
vis [-bcfhlmnostw] [-e extra] [-F foldwidth] [file ...]
DESCRIPTION
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 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
``cat -v''. (VIS_NOSLASH)
-c Request a format which displays a small subset of the non-printable characters using C-style backslash sequences. (VIS_CSTYLE)
-e extra
Also encode characters in extra, per svis(3).
-F foldwidth
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 original form with 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.
-f Same as -F.
-h Encode using the URI encoding from RFC 1808. (VIS_HTTPSTYLE)
-l Mark newlines with the visible sequence '$', followed by the newline.
-m Encode using the MIME Quoted-Printable encoding from RFC 2045. (VIS_MIMESTYLE)
-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. (VIS_OCTAL)
-s Only characters considered unsafe to send to a terminal are encoded. This flag allows backspace, bell, and carriage return in addi-
tion to the default space, tab and newline. (VIS_SAFE)
-t Tabs are also encoded. (VIS_TAB)
-w White space (space-tab-newline) is also encoded. (VIS_WHITE)
MULTIBYTE CHARACTER SUPPORT
vis supports multibyte character input. The encoding conversion is influenced by the setting of the LC_CTYPE environment variable which
defines the set of characters that can be copied without encoding.
When 8-bit data is present in the input, 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.
ENVIRONMENT
LC_CTYPE Specify the locale of the input data. Set to C if the input data locale is unknown.
SEE ALSO
unvis(1), svis(3), vis(3)
HISTORY
The vis command appears in 4.4BSD. Myltibyte character support was added in NetBSD 7.0 and FreeBSD 9.2.
BSD
February 19, 2013 BSD