连接变量

Question

我需要为 DOS 执行以下操作的 .bat：

set ROOT = c:\programas\
set SRC_ROOT = (I want to put the ROOT Here)System\Source

所以在定义ROOT之后我想要SRC_ROOT = c:\programas\System\Source

我怎样才能做到这一点？

Answer 1

set ROOT=c:\programs 
set SRC_ROOT=%ROOT%\System\Source

Answer 2

请注意，如果字符串有空格，则定义时需要使用引号，并且在连接时必须将其截断：

rem The retail files set
set FILES_SET="(*.exe *.dll"

rem The debug extras files set
set DEBUG_EXTRA=" *.pdb"

rem Build the DEBUG set without any
set FILES_SET=%FILES_SET:~1,-1%%DEBUG_EXTRA:~1,-1%

rem Append the closing bracket
set FILES_SET=%FILES_SET%)

echo %FILES_SET%

干杯...

Answer 3

如果需要用引号连接路径，可以使用

=

来替换变量中的引号。这不需要您知道路径是否已包含引号。如果没有引号，则不会发生任何更改。

@echo off
rem Paths to combine
set DIRECTORY="C:\Directory with spaces"
set FILENAME="sub directory\filename.txt"

rem Combine two paths
set COMBINED="%DIRECTORY:"=%\%FILENAME:"=%"
echo %COMBINED%

rem This is just to illustrate how the = operator works
set DIR_WITHOUT_QUOTES=%DIRECTORY:"=%
echo %DIR_WITHOUT_QUOTES%