为什么Perl系统调用无法调用内部Windows命令？ [英] Why is Perl system call failing to invoke internal Windows command?

问题描述

在我们的Windows XP计算机上，Perl系统命令如 dir / b 会生成一个错误消息，例如： / b：no such文件或目录。换句话说，开关被解释为文件名。

On one of our Windows XP machines, Perl system commands such as dir /b generate an error message such as: /b: no such file or directory. In other words, the switch is being interpreted as a filename.

这是因为我使用 backticks ， open（）或 system（）。我甚至尝试传递作为一个单独的arg到system（）的开关。当然，我已经确认调用在DOS命令行或批处理脚本上正确工作。

This occurs whether I use backticks, open() or system(). I even tried passing in the switch as a separate arg to system(). Naturally, I have confirmed that the call works correctly on the DOS command line or batch script.

有人遇到过这个吗？

推荐答案

安装和 dir.exe 是在您的路径，它不是 cmd.exe 内置但是别名为 ls 。

You probably have Cygwin installed and dir.exe is in your path which is not the cmd.exe built-in but an alias to ls.

C:\> which dir
/usr/bin/dir

C:\> c:\opt\cygwin\bin\dir.exe --version
dir (GNU coreutils) 8.15
Packaged by Cygwin (8.15-1)
…

C:\> dir /b
…

C:\> perl -e "print `dir /b`"
dir: cannot access /b: No such file or directory

C:\> perl -e "print `cmd /c dir /b`"
…

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