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+# 1. Ubuntu:
+
+```
+apt-get install openssl cron  netcat-openbsd  curl
+```
+
+Either `netcat` or `netcat-openbsd` is also working.
+```
+apt-get install netcat
+```
+
+
+# 2. CentOS
+
+```
+yum -q -y install  openssl  crontabs  nc  curl
+```
+
+
+