LV(1)LV(1)NAMElv - a Powerful Multilingual File Viewer / Grep
SYNOPSIS
lv, lgrep
lv-h
lv-V
lv [-acdfgiklmnqsuvz] [+acdfgiklmnqsuvz]
[-Acoding-system] [-Icoding-system] [-Kcoding-system]
[-Ocoding-system] [-Pcoding-system] [-Dcoding-system]
[-Ssseq] [-Srseq] [-Sbseq] [-Suseq] [-Shseq]
[-Tnumber] [-Wwidth] [-Hheight] [-E'editor'] [-+]
[+number] [+/grep-pattern]
[-] (grep-pattern) [files ...]
DESCRIPTION
Multilingual file viewer
lv is a powerful multilingual file viewer. Apparently, lv looks
like less (1), a representative file viewer on UNIX as you know,
so UNIX people (and less people on other OSs) don't have to
learn a burdensome new interface. lv can be used on MSDOS ANSI
terminals and almost all UNIX platforms. lv is a currently
growing software, so your feedback is welcome and helpful for us
to refine the future lv.
Multiple coding systems
lv can decode and encode multilingual streams through many cod‐
ing systems, for example, ISO 2022 based coding systems such as
iso-2022-jp, and EUC (Extended Unix Code) like euc-japan. Fur‐
thermore, localized coding systems such as shift-jis, big5 and
HZ are also supported. lv can be used not only as a file viewer
but also as a coding-system translation filter like nkf (1) and
tcs (1).
Multilingual regular expressions / Multilingual grep
lv can recognize multi-bytes patterns as regular expressions,
and lv also provides multilingual grep (1) functionality by giv‐
ing it another name, lgrep. Pattern matching is conducted in
the charset level, so an EUC fragment, for example, can be found
in the ISO 2022 tailored streams, of course.
Supporting the Unicode standard
lv provides Unicode facilities which enables you to handle Uni‐
code streams encoded in UTF-7 or UTF-8, and lv can also convert
their code-points between Unicode and other charsets. So you
can display Unicode or foreign texts on your terminal, using the
code conversion function to your favorite charsets via Unicode.
(However, MSDOS version of lv has none of the Unicode facility.)
ANSI escape sequence through
lv can recognize ANSI escape sequences for text decoration. So
you can look ANSI-decorated streams such as colored source codes
generated by another software just like intended image on ANSI
terminals.
Completely original
lv is a completely original software including no code drawn
from less and grep and other programs at all.
OPTIONS
-A<coding-system>
Set all coding systems to coding-system.
-I<coding-system>
Set input coding system to coding-system.
-K<coding-system>
Set keyboard coding system to coding-system. If it is not set,
output coding system will be applied to it.
-O<coding-system>
Set output coding system to coding-system.
-P<coding-system>
Set pathname coding system to coding-system.
-D<coding-system>
Set default (fall-back) coding system to coding-system.
coding-system:
a: auto-select
c: iso-2022-cn
j: iso-2022-jp
k: iso-2022-kr
ec: euc-china
ej: euc-japan
ek: euc-korea
et: euc-taiwan
u7: UTF-7
u8: UTF-8
l1..9: iso-8859-1..9
l0: iso-8859-10
lb,ld,le,lf,lg: iso-8859-11,13,14,15,16
s: shift-jis
b: big5
h: HZ
r: raw mode
Examples:
-Il2: input coding system is iso-8859-2
-Ks: keyboard coding system is shift-jis
-Oek: output coding system is euc-korea
-Ab: all coding systems are big5
Coding-system translations / Code-points conversions:
iso-2022-cn, -jp, -kr can be converted into euc-china or -tai‐
wan, euc-japan, euc-korea, respectively (and vice versa).
shift-jis uses the same internal code-points as iso-2022-jp and
euc-japan.
Since big5 characters can be converted into CNS 11643-1992 with
negligible incompleteness, big5 streams can be translated into
iso-2022-cn or euc-taiwan (and vice versa) with code-points con‐
version. Note that the iso-2022-cn referred here is not GB
sequence, only just CNS one. You should remember that lv cannot
translate big5 into GB directly.
The search function of lv may not work correctly when lv addi‐
tionally performs ``code-points'' conversion (not ``coding-sys‐
tem'' translation), because visible code and internal code are
different from each other. lv will try to avoid this problem
with converting charsets of search patterns automatically, but
this function is not always perfect.
-W<number>
Screen width
-H<number>
Screen height
-E'<editor>' (default 'vi -c %d')
Editor name (default 'vi -c %d')
``%d'' means the line number of current position in a file.
-q Assert there is delete/insert-lines control.
Please set this option on a MSDOS ANSI terminal that has capa‐
bility to delete and/or insert lines. As to termcap and ter‐
minfo version, it will be set automatically.
-Ss<seq>
Set ANSI Standout sequence to seq (default "7")
-Sr<seq>
Set ANSI Reverse sequence to seq (default "7")
-Sb<seq>
Set ANSI Blink sequence to seq (default "5")
-Su<seq>
Set ANSI Underline sequence to seq (default "4")
-Sh<seq>
Set ANSI Highlight sequence to seq (default "1")
These sequences are inserted between ``ESC ['' and ``m'' to con‐
struct full ANSI escape sequences.
-T<number>
Set Threshold-code which divides Unicode code-points in two
regions. Characters belonging to the lower region are assumed to
have a width of one, and the higher characters are equated to a
width of two. (Default: 12288, = 0x3000)
-m Force Unicode code-points which have the same glyphs as
iso-8859-* to be Mapped to iso-8859-* in a conversion from Uni‐
code to another character set which also has the corresponding
code-points, in particular, Asian charsets.
-a Adjust character set for search pattern (default)
-c Allow ANSI escape sequences for text decoration (Color)
-d, -i Make regexp-searches ignore case (case folD search) (default)
-f Substitute Fixed strings for regular expressions
-k Convert X0201 Katakana to X0208 while decoding
-l Allow physical lines of each logical line printed on the screen
to be concatenated for cut and paste after screen refresh
-s Force old pages to be swept out from the screen Smoothly
-u Unify several character sets, eg. JIS X0208 and C6226. In addi‐
tion, lv equates ISO 646 variants, eg. JIS X0201-Roman, and
unknown charsets with ASCII.
-g Turn on lgrep mode.
-n Prefix each line of output with the line number within its input
file on lgrep.
-v Invert the sense of matching on lgrep.
-z Enable HZ auto-detection (also enabled by run-time C-t).
-+ Clear all options
You can also turn OFF specified options, using ``+<option>''
like +c, +d, ... +z.
- Treat the following arguments as filenames
grep-pattern
lv works like grep (1) when its name is lgrep
+number
Jump to the specified line immediately when lv is invoked.
+/grep-pattern
Search the specified pattern immediately when lv is invoked.
-V Show lv version
-h Show this help
CONFIGURATION
Options can be described in configuration file ``.lv'' (``_lv'' on
MSDOS) located at you HOME directory. If and only if you use MSDOS,
you can locate ``_lv'' at current working directory. They can be also
described in the environment variable LV. Every configuration will be
overloaded in this order if there is. Command line options are always
read finally.
COMMAND KEY BINDINGS
0..9: Argument
g, <: Jump to the line number (default: top of the file)
G, >: Jump to the line number (default: bottom of the file)
p: Jump to the percentage position in line numbers (0-100)
b, C-b:
Previous page
u, C-u:
Previous half page
k, w, C-k, y, C-y, C-p:
Previous line
j, C-j, e, C-e, C-n, CR:
Next line
d, C-d:
Next half page
f, C-f, C-v, SP:
Next page
F: Jump to the end of file, and wait for a data to be appended to
the file until interrupted.
/<string>:
Find a string in the forward direction (regular expression)
?<string>:
Find a string in the backward direction (regular expression)
n: Repeat previous search in forward direction
N: Repeat previous search in backward direction (not REVERSE)
C-l: Redisplay all lines
r, C-r:
Refresh screen and memory
R: Reload current file
:n: Examine the next file
:p: Examine the previous file
t: Toggle input coding systems
T: Toggle input coding systems reversely
C-t: Toggle HZ decoding mode
v: Launch the editor defined by option -E
C-g, =:
Show file information (filename, position, coding system)
V: Show LV version
C-z: Suspend (call SHELL or ``command.com'' under MSDOS)
q, Q: Quit
UP/DOWN:
Previous/Next line
LEFT/RIGHT:
Previous/Next half page
PageUp/PageDown:
Previous/Next page
HOW TO INPUT SEARCH STRINGS?
C-m, Enter:
Enter the current string
C-h, BS, DEL:
Delete one character (backspace)
C-u: Cancel the current string and try again
C-p: Restore a few old strings incrementally (history)
C-g: Quit
REGULAR EXPRESSION
Special characters are ^, $, ., *, +, ?, [, ^, -, ], \. \| specifies
an alternative. \(, \) is a grouping construct. \1 and \2 matches any
charset consists of one- or two- column(s) characters respectively.
Mutually overlapping ranges (or charset) are not guaranteed.
SEE ALSO
LV Homepage: http://www.ff.iij4u.or.jp/~nrt/lv/
COPYRIGHT
All rights reserved. Copyright (C) 1996-2004 by NARITA Tomio.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MER‐
CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
BUG REPORT
Please send bug reports to: nrt@ff.iij4u.or.jp
v.4.51 (Jan.16th,2004) LV(1)
