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$ perl -V:yo -Te " undef $ENV{PATH}; system q/perl -e die /"
yo='UNKNOWN';

$  perl -V:yo -Te " undef $ENV{PATH}; exec q/perl -e die /"
yo='UNKNOWN';

$ Died at -e line 1.

$ set path=

$ C:\perl\5.12.2\bin\MSWin32-x86-multi-thread\perl.exe -V:yo -Te " und
+ef $ENV{PATH}; exec qw/perl -e die /"
yo='UNKNOWN';

$ perl -le "  exec q{C:\WINDOWS\system32\cmd.exe /x /c }.qq{\x22perl -
+e die\x22};  "

$ Died at -e line 1.

$ perl -le " undef $ENV{PATH}; exec q{C:\WINDOWS\system32\cmd.exe /x /
+c }.qq{\x22perl -e die\x22};  "

$ 'perl' is not recognized as an internal or external command,
operable program or batch file.

$ perl -V:yo -le " undef $ENV{PATH}; exec q{cmd.exe /x /c }.qq{\x22per
+l -e die\x22};  "
yo='UNKNOWN';
...

$ 'perl' is not recognized as an internal or external command,
operable program or batch file.

$ set path=

$ C:\perl\5.12.2\bin\MSWin32-x86-multi-thread\perl.exe  -V:yo -le " un
+def $ENV{PATH}; exec q{cmd.exe /x /c }.qq{\x22perl
 -e die\x22};  "
yo='UNKNOWN';