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• -A

• What are -e, -z, -s, -M, -A, -C, -r, -w, -x, -o, -f, -d , -l in Perl?

• Three-argument form of open used and it is not available until perl 5.6.

• Solution: improve Apache log-analyzer - video

• Always use 3-argument open

• Stand-alone Ajax client and the Access-Control-Allow-Origin issue