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下面是nset命令的说明:
------------------------------------------------------------------------
NSET Extract from STDIN Ver 2.1 (c) 1997 Horst Schaeffer
------------------------------------------------------------------------
Note: Setting variable is not supported under Win NT/2000/XP
See work-around described in NSET.W2K
NSET picks a word, line or substring from STDIN and assigns it to an
environment variable (or sends it to STDOUT). Useful if you want to
extract data from DOS output of DIR, DATE, TIME, FIND etc. - but you'll
probably find lots of other applications...
Syntax: NSET =string
-------------------------------
options: /S /X /U /L /P (see below)
varname: name of environment variable
if the name is omitted, the result is sent to STDOUT
string: is usually a token $1...$99 for the n-th word of STDIN,
or $0 for a complete line.
But you can use any text string with one or more embedded
tokens to form the resulting string.
Using STDIN, examples:
by PIPE: CD | NSET SDIR=$1 (SDIR=current directory)
from a file: NSET X=$3 < some.txt (X=3rd word from some.txt)
keyboard: NSET IN=$0 (IN=input up to CR)
Tokens $1..$99 refer to "words" from STDIN, defined by the following
standard separators:
blank space
comma
semicolon
equal sign
carriage return
line feed
For other separators or substrings see options.
If the input has several lines, just count the words across lines
(unless option /L is used to restrict extraction to a specific line).
Trailing spaces are always removed. Keyboard input is limited to one
line, terminated by ENTER (Ctrl"Z" not required).
Options
-------
/S additional separators (max: 24), terminated by a blank space (!)
As an example, you can split up the current date to translate
UK (with slashes) to US format (day and month swapped):
echo.|date|NSET /S/ USdate=$6-$5-$7
^^^
UK date output: Current Date is Mon, 15/07/1996
tokens: $1 $2 $3 $4 $5 $6 $7
^^^^^^^^^^
/X instead of /S:
same as /S, however, standard separators are only: space, CR and LF.
Comma, semicolon or equal sign have to be specified if required.
(This allows exclusion of comma marks in numbers, for example).
Option /X can be used without additional separators, but in any
case a blank space must succeed to indicate the end of option /X.
/U convert input words to upper case
/L extract from specified line (line numbers: 1..9999)
Tokens refer to words within this line only.
Example: to get the directory path of a given file %fn%
only the 4th line of the DIR output is used:
DIR %fn% | NSET /L4 FPATH=$3
^^
Special feature:
/L? (question mark instead of a number) selects a random line.
/P position (1 is leftmost), size (default: rest of line)
This option will cut out a substring from a line. Tokens refer to
words within this substring, $0 is the complete substring.
In the following example 10 bytes are taken from pos.3 in line 5:
NSET /P3,10 /L5 X=$0
^^^^^
Get 2nd word from the rest of 1st line, starting at position 14:
NSET /P14 X=$2
With token $0 the complete line (or substring) is taken regardless of
any separators. Leading spaces are not removed in this case.
Use with option /L unless you want line #1 (or there is only one).
STDOUT instead of variable
--------------------------
If you omit the variable name, the result will be sent to STDOUT.
Note that the equal sign must not be omitted!
Useful for testing or for redirection to a file.
Example:
NSET /L? =$0 < taglines.lst > tagline.now
Notes:
------
Max input size is about 60 KB (rest ignored)
Errorlevel: 0: ok, 1: out of environment space or invalid options
To avoid conflicts when numeric data occur in the command string,
you may use e.g. $01 instead of $1 (because max 2 digits are read for
tokens):
$15 is the 15th word
$015 is the 1st word succeeded by constant "5"
More Examples:
--------------
dir %file% /B | NSET /S. FN=$1 (file name without extension)
dir %file% /B | NSET /S. EXT=$2 (file extension only)
vol | NSET DRV=$4: (current drive)
echo %string%| NSET /U string=$0 (convert string to upper case)
echo %string%| NSET /P2,1 char=$1 (get 2nd char from string)
To save and restore drive and directory in a BAT file:
CD | NSET XDIR=$1 (save full path in XDIR)
-----------------
%XDIR%\ (select drive *)
CD %XDIR% (select directory)
*) undocumented DOS feature: with trailing backslash the drive is
selected (rest ignored). Does not work under NT/2000/XP.
----
NSET is freeware by Horst Schaeffer - no warranties of any kind
eMail: horst.schaeffer@gmx.net
= 04 AUG 2002
谁能帮忙翻译一下,我想对大家在bat文件里处理字符串是有不少好处的!
Last edited by 不得不爱 on 2008-12-30 at 09:52 ]
