FOR /参数 %variable IN (set) DO command [command_parameters] %variable:指定一个单一字母可替换的参数,如:%i ,而指定一个变量则用:%%i ,而调用变量时用:%i% ,变量是区分大小写的(%i 不等于 %I)。 批处理每次能处理的变量从%0—%9共10个,其中%0默认给批处理文件名使用,%1默认为使用此批处理时输入...
语法:FOR %%variable IN (set) DO command [command-parameters] 对一组文件中的每一个文件执行某个特定命令。 %%variable 指定一个单一字母可替换的参数。 (set) 指定一个或一组文件。可以使用通配符。 command 指定对每个文件执行的命令。 command-parameters 为特定命令指定参数或命令行开关。 例如一个批处理文...
If used in a batch file,echo onandecho offdon't affect the setting at the command prompt. If there's an empty variable in a batch file while usingecho, it displays "ECHO is off". To prevent seeing this message, and produce a blank line instead, place a colon (:) betweenechoand th...
How to Evaluate a Command's Exit Code You can use the call command on a variable or a script that ends in the command you wish to evaluate. Doing this will force the %ErrorLevel% variable to be updated with the exit code of the last command. Example cmd /v:on set command...
The command prints the text in the output. However,echooffers additional options regarding formatting the output and working with different parameters. For example, set the parameter$name: $name = "Sara" Next, runechoon the variable: echo $name ...
If used in a batch file,echo onandecho offdon't affect the setting at the command prompt. If there's an empty variable in a batch file while usingecho, it displays "ECHO is off". To prevent seeing this message, and produce a blank line instead, place a colon (:) betweenechoand th...
FOR %%variable IN (set) DO command [command-parameters] %%variable 指定一个单一字母可替换的參数。 (set) 指定一个或一组文件。能够使用通配符。 command 指定对每一个文件运行的命令。 command-parameters 为特定命令指定參数或命令行开关。 比如一个批处理文件里有一行: ...
In this example,$NAMEis different from$name, soecho $NAMEoutputs nothing. Echo Command Not Found If you’re getting a ‘command not found’ error when trying to useecho, it’s likely that your PATH environment variable is misconfigured. To solve this, you can specify the full path to the...
FOR %%variable IN (set) DO command [command-parameters] %%variable 指定一个单一字母可替换的参数。 (set) 指定一个或一组文件。可以使用通配符。 command 指定对每个文件执行的命令。 command-parameters 为特定命令指定参数或命令行开关。 例如一个批处理文件中有一行: ...
Thereadcommand waits for the user to type something and pressEnter. Whatever the user types is stored in the variable$name. Theecho "Hello, $name!"command prints a greeting message that includes the$namevariable value. Since we enteredSaraat the prompt, the output isHello, Sara!. ...