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echo on

...
del pipe.pl
cd ..
rmdir pipe

C:\> echo on

...
C:\pipe> pipe
'pipe' is not recognized as an internal or external command,
operable program or batch file.

C:\pipe> perl -e "print 'print qq(| $_) while <>'"  1>pipe.pl

...
C:\pipe> pipe  0<pipe.pl

C:\pipe> type pipe.pl   | pipe

C:\pipe> set pathext=.com;.exe;.bat;.cmd;

...
C:\pipe> pipe  0<pipe.pl
'pipe' is not recognized as an internal or external command,
operable program or batch file.

C:\pipe> set pathext=.com;.exe;.bat;.cmd;.pl;

...
C:\pipe> pipe  0<pipe.pl

C:\pipe> type pipe.pl   | pipe

C:\pipe> del pipe.pl

...
C:\> rmdir pipe

C:\>