Install preparations

1. Ubuntu:

apt-get install openssl cron  netcat-openbsd  curl

Or install netcat.

apt-get install netcat

yum -q -y install  openssl  crontabs  netcat-openbsd curl

For centos 5:

yum -q -y install openssl vixie-cron netcat-openbsd curl

Or install nc

yum -q -y install nc

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