Problem generating output

After install of all needed plugins and packages I’m able to run script:

./check_esx3-0.5.pl
Usage: check_esx3-0.5.pl -D | -H [ -N ]
-u -p | -f
-l [ -s ]
[ -x ] [ -o ]
[ -t ] [ -w ] [ -c ]
[ -V ] [ -h ]

Missing argument: command

So I assume there is nothing to add from perl/plugins/toolikts etc…

However I had a problem since after runing a command to check something like:

./check_esx3-0.5.pl -H IP.of.single.esx -u user -p password -l cpu

I see in Events on GUI that user was logged, but script running for 10 minutes without any output. What need to be checked?