Question

I would like my scripts works on Windows and UNIX system, so I want some code as blew(just a sample, not work)

if $^O eq 'MSWin32' {
#!/c:/perl/bin/perl.exe
}
else { / non-windows system
#!/usr/local/bin/perl
}

is there any way to do this in perl? it seems the #! line must be the first line of a perl script, so this is impossible?

Answer 1

The shebang (#!/path/to/interpreter) is only used on unix-like systems. And it has to be the first line. On Windows systems, the shebang is not used, instead file ending associations may be used: you can associate the .pl file ending with the perl interpreter.

Command line switches in the shebang will be interpreted by the perl interpreter, regardless of platform.

A safe way to launch perl scripts on all platforms is to actually use the perl command. It will be available in case of an successfull Perl installation. E.g. perl myscript.pl instead of ./myscript.pl. The second options requires that the file is set as “executable” on *nix systems.