With a Windows case sensitive file system (and according mount flags for /cygdrive), the PATH does not properly reflect casing of the actual directories (e.g. C:\WINDOWS vs. C:\Windows, thanks MS...). However, the shell finds programs anyway, like e.g. notepad. The exec*p system calls, on the other hand, do not find a program in this case as demonstrated by the attached test program. This is in contrast to the Linux (and POSIX?) manual page which claims „The execlp(), execvp(), and execvpe() functions duplicate the actions of the shell in searching for an executable file …“
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