I was also surprised ...

Why? 

$ perl -V:sh
sh='cmd /x /c';

[download]

Unless your cygwin perl hash something bash in there, cmd.exe is your shell

My *cygwin*alike* has 

$ C:\citrusperl\mingw\msys\bin\perl -V:sh
sh='/bin/sh';

[download]

So even if *my*cygwin*alike* has got /bin/sh , it won't work when calling perl from cmd.exe, only from the bash itself ... in actual cygwin that might get resolved (if cygwin perl is linked to cygwin dll) but it depends on the perl being called

In reply to Re^2: run in-program shell script under windows using cygwin by Anonymous Monk
in thread run in-program shell script under windows using cygwin by sandy105

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