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• Strings in Perl: quoted, interpolated and escaped

• strings in single quotes - video

• $a - $b - Special variables when using sort(). Don't use them for anything else besides your sort function!

• Don't use $a and $b outside of sort, not even for examples

• Can't locate object method "..." via package "1" (perhaps you forgot to load "1"?)

• Don't Open Files in the old way

• Crypt::SSLeay - 500 Can't connect to ____ (Crypt-SSLeay can't verify hostnames)

• Using 'like' to test without exact values

• Don't put & in-front of subroutines in Perl

• Can't use Net::Appliance::Session inside a thread

• Don't interpolate in printf (Missing argument in sprintf at ...)

• What's new in Perl 5.10? say, //, state

• Private Member Data shouldn't be accessed directly - encapsulation violation

• Argument ... isn't numeric in numeric ...

• Can't locate ... in @INC

• Can't use string (...) as an HASH ref while "strict refs" in use at ...

• Implementing 'is_any' to test multiple expected values

• The 'if' statement - video

• Does the 'all' function of List::MoreUtils really short-circuit?

• Don't keep generated files in version control