echo File : %0 echo Name : %1 echo Address: %2 环境变量 使用%<environment-variable-name>% 也可以访问环境变量。 注释 有两种方式写注释: @rem :: @echo off echo begin @rem first comment :: second comment echo end 分支语句 if ... else ... 使用if ... else ... 进行条件判断,也可以...
echo filename. missing. ) EQU - 等于 NEQ - 不等于 LSS - 小于 LEQ - 小于或等于 GTR - 大于 GEQ - 大于或等于` if "%1"=="/a" echo 第一个参数是/a if /i "%1" equ "/a" echo 第一个参数是/a #/i 表示不区分大小写,equ 和 == 是一样的,其它运算符参见 if/? if exist tes...
1)batch file %VariableName:~StartPosition,Length% seta=superhero settemp=%a:~0,-3% echo%temp% pause 将显示superh 即显示了变量a的第0位和第-3位中间包含的所有字符。 2) shell file ${varname:offset:length} Purpose: Returning parts of a string(substrings or slices). STRING="thisisaverylong...
d.有或者没有 usebackq 选项:FOR /F ["options"] %variable IN (file-set) DO commandFOR /F ["options"] %variable IN ("string") DO commandFOR /F ["options"] %variable IN (command) DO command参数"options"为:eol=c - 指一个行注释字符的结尾(就一个,如“;”)skip=n - 指在文件开始时...
描述: 批处理中主要使用if语句命令执行批处理程序中的条件处理。 语法示例: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 IF[NOT]ERRORLEVELnumber command1ELSEcommand2IF[NOT]string1==string2 commandELSEcommand2IF[NOT]EXISTfilename commandELSEcommand2 ...
判断某两个数值是否相等,用if 数值1 equ 数值2语句; 例如:if 1 equ 2 判断某个变量是否已经被赋值,用if defined str语句; 例如:if defined str 7 For 命令格式为 : FOR %%variable IN (set) DO command [command-parameters] 其中: %%variable指定一个单一字母可替换的参数。
@echo off if exist C:\set2.txt echo "File exists" if exist C:\set3.txt (echo "File exists") else (echo "File does not exist") OutputLets assume that there is a file called set2.txt in the C drive and that there is no file called set3.txt. Then, following will be ...
if string1 == string2 command This is used in combination with command-line variable or environment variable substitution, as in this example: if "%1" == "ERASE" delete somefile.dat If and only if the batch file's first argument is the word ERASE, this command will delete the file...
• See how errorlevels are used to check theavailabilityof third party tools, and how your batch file can even help the user download the tool if it isn't available. • This blog entry by Batcheero explains perfectly why you shouldnever SETthe ERRORLEVEL variable. ...
这个脚本将检查变量 VAR 是否等于 “hello”,如果是,则输出 “The variable is hello”。 例:判断文件是否存在 @echo offif exist myfile.txt echo The file exists 如果文件存在,运行结果: The file exists 2.if-else 语句 例:判断变量是否等于hello,如果等于就输出The variable is hello. ...