Test GSM Modem Using minicom

If you want to test your GSM modem before running any application such as SMS gateway, a lightweight application called minicom can be used for this purpose. To install minicom,…

How to Verify SSL Certificates

How to Verify SSL Certificates   openssl x509 -in -text -noout Example: openssl x509 -in nagios.crt -text -noout Output: Not Before: Mar 29 09:38:10 2011 GMT Not After : Jan…

Tip: How to Use Awk with Netstat

With malicious attacks coming from anywhere targeting our webservers, we, as system administrators, need to know whether the server is under a certain attack, like Denial of Service or most…

Tip: How to Schedule Tasks

If you are using Windows, you are probably familiar with task scheduler to schedule certain tasks automatically. With Linux, tasks can be done on scheduled dates with cron. cron is…

10 Good Unix Habits

Adopt 10 good habits that improve your UNIX® command line efficiency — and break away from bad usage patterns in the process. This article takes you step-by-step through several good,…