in reply to installing perl 5.12.3

What operating system are you running?

You probably have both versions installed. The one installed using the OS's package manager is the one aliased to "perl" without qualification.

You should be able to run the desired version using a qualified name: try perl5.12.3 -v.

You might have it on a different path than the OS's installed version, too.

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Re^2: installing perl 5.12.3
by rob171171 (Acolyte) on Apr 21, 2011 at 09:11 UTC
    Linux 2.6.24.5-85.fc8 my PATH is
    PATH=/usr/kerberos/sbin:/usr/kerberos/bin:/usr/lib/ccache:/usr/local/b +in:/usr/bin:/bin:/usr/X11R6/bin:/home/pats/bin
    command not found results from perl5.12.3 -v.