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I installed Active Perl 5.20 and also Strawberry Perl 5.20 after uninstalling Active Perl.

In both cases, when I open cmd and type 'perl' I get:

Unknown Unicode option letter ':'.

This error also prevents all scripts from running on my Windows 8.1 installation.

I uninstalled Perl and did a fresh install and it still doesn't work.

Are there dependencies that I need to install? I googled the error but the results pertain to Linux installations where the script specified something wrong. But I get this error when I even try to use any perl command line or script. So my problem is not a faulty script.

Kevin
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2 Answers2

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That is the error message you get from using an invalid value for the -C command-line option. At a guess I'd say you have the PERL_UNICODE environment variable set to a string that contains a colon :.

Take a look at Command Switches in perldoc perlrun for more detail on this.

Borodin
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I too had this problem on windows 8.1 . The problem is that, once on installation, .pl files are not automatically recognized by Perl engine. So please select a .pl file and right click and say open with and set the default program to C\perl\bin\ inside it click perl.exe and recognize it. Once this is done your perl works flawlessly.

Liveon Biolabs
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