Why can't I execute a Cygwin .exe directly with Java on Windows?

问题

I've installed Cygwin but can't seem to access any commands directly. For example, the process below doesn't start due to bash.exe not found even though I'm specifying it's absolute path. I know it's installed correctly since I can see this path in the File Explorer. However, searching for any cygwin file doesn't return any hits which is odd.

ProcessBuilder pb = new ProcessBuilder("C:\\cygwin64\\bin\\bash.exe", "-c", "ls");
Process p = pb.start();

java.io.IOException: Cannot run program "‪C:\cygwin64\bin\bash.exe" (in directory "C:\Users\tyea1\Documents\Log Bundles\latest_PRODXIO01"): CreateProcess error=2, The system cannot find the file specified

If I add cygwin's bin to the Windows PATH variable, I can successfully execute "ls" via

ProcessBuilder pb = new ProcessBuilder("cmd", "/c", "ls");
Process p = pb.start();

I still can't access bash.exe directly when it's in the PATH.

I don't understand what is going on here and why I can't execute bash.exe directly.

回答1:

I haven't exactly answered my own question but found something that works. With the cygwin \bin in the Windows PATH, my process builder string is:

[cmd, /c, C:\cygwin64\bin\sh.exe, -c, ls]

This seems to be working. I'm using sh.exe instead of bash.exe so that I can use all of cygwin's bin files.

来源：https://stackoverflow.com/questions/54818613/why-cant-i-execute-a-cygwin-exe-directly-with-java-on-windows