如何批量增加文件名? [英] How do I increment a filename in batch?
问题描述
我正在编写一个批处理文件，该文件可以使用google maps地理位置API跟踪丢失的android手机.我无法理解我的代码出了什么问题.我遵循了在互联网上找到的所有内容，但是如果运行代码，它将返回语法不正确"或类似的信息.如果存在基本名称，则基本上会增加文件名.您能告诉我我的代码有什么问题以及如何纠正它吗?
:MainProcessNew
cd C:\Users\%USERNAME%\Documents
for %%G IN (*.json) do (
set file = %%G
)
set "baseName=data"
set "n=0"
:loop
set /a n+=1
if exist "%baseName%%n%.json (
goto loop
)
echo.>"C:\Users\%USERNAME%\Documents\data%n%.json"
使用此批处理代码:
:MainProcessNew
cd /D "%USERPROFILE%\Documents"
for %%G in (*.json) do set "FileName=%%G"
set "BaseName=data"
set "FileNumber=0"
:FileNameLoop
set /A FileNumber+=1
if exist "%BaseName%%FileNumber%.json" goto FileNameLoop
echo/>"%USERPROFILE%\Documents\%BaseName%%FileNumber%.json"
主要错误是 IF 条件行中缺少双引号.
但是还有其他错误和代码行可以改进.
请勿使用C:\Users\%USERNAME%，因为用户的配置文件目录也可以位于驱动器C:以外的其他驱动器上.改用预定义的环境变量USERPROFILE的值.
当前用户的documents文件夹路径可以包含1个或多个空格，例如，当用户名包含空格时.因此，始终将与用户配置文件相关的文件夹路径括在双引号中.
如果不能100％保证批处理过程的当前目录和新的当前目录位于同一驱动器上，则应始终将命令 CD 与/D一起使用，以也更改当前驱动器. /p>
请不要为环境变量赋一个等号附近的值，请参见为什么不输出带有'echo％var％'的字符串在命令行上使用"set var = text"后?解释此常见错误.
如果只应执行1条命令，则不要为命令 FOR 和 IF 定义带括号的命令块，因为这两个命令最初只用于运行1条命令命令.
建议在CamelCase表示法中使用良好的变量名.搜索n很难找到该环境变量的所有出现，但是搜索FileNumber非常容易.
要了解所使用的命令及其工作方式，请打开命令提示符窗口，在其中执行以下命令，并非常仔细地阅读每个命令显示的所有帮助页面.
-
cd /? -
echo /? -
for /? -
goto /? -
if /? -
set /?
I am programming a batch file that can track lost android phones using the google maps geolocation API. I cannot understand what is wrong with my code. I followed everything I found on the internet but if I run the code, it returns "the syntax was incorrect" or something like that.It basically increments a filename if the basename exists. Can you show me what is wrong with my code and how do I correct it?
:MainProcessNew
cd C:\Users\%USERNAME%\Documents
for %%G IN (*.json) do (
set file = %%G
)
set "baseName=data"
set "n=0"
:loop
set /a n+=1
if exist "%baseName%%n%.json (
goto loop
)
echo.>"C:\Users\%USERNAME%\Documents\data%n%.json"
Use this batch code:
:MainProcessNew
cd /D "%USERPROFILE%\Documents"
for %%G in (*.json) do set "FileName=%%G"
set "BaseName=data"
set "FileNumber=0"
:FileNameLoop
set /A FileNumber+=1
if exist "%BaseName%%FileNumber%.json" goto FileNameLoop
echo/>"%USERPROFILE%\Documents\%BaseName%%FileNumber%.json"
The main mistake is the missing double quote in IF condition line.
But there are also other mistakes and code lines which could be improved.
Don't use C:\Users\%USERNAME% because the profile directory of a user can be also on another drive than drive C:. Use instead the value of the predefined environment variable USERPROFILE.
The path to documents folder of the current user can contain 1 or more spaces, for example when the user name contains a space. Therefore always enclose user profile related folder paths in double quotes.
The command CD should be used always with /D to change also the current drive if it is not 100% guaranteed that current directory of batch process and new current directory are on same drive.
Never assign a value to an environment variable with spaces around equal sign, see Why is no string output with 'echo %var%' after using 'set var = text' on command line? for an explanation of this common mistake.
Don't define a command block with parentheses for the commands FOR and IF if just 1 command should be executed as those two commands are originally designed for running only 1 command.
It is advisable to use good variable names in CamelCase notation. It is hard to search for n to find all occurrences of that environment variable, but is very easy to search for FileNumber.
For understanding the used commands and how they work, open a command prompt window, execute there the following commands, and read entirely all help pages displayed for each command very carefully.
cd /?echo /?for /?goto /?if /?set /?
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