system administrators

How do I disable Squid Proxy Serer under CentOS Linux operating system so that I can directly connect to the internet?


Q. How do I install Strace utility under FreeBSD operating system so that I can trace and debug my applications and report 3rd party software bugs? A. Strace is a process tracer, i.e. a debugging tool that prints out a trace of all the system calls made and signals received by a process itself or […]


Q. Solaris and FreeBSD both provide the truss command to monitor and debug system calls. I’m unable to find this command or package. How can I install truss under Linux? A. truss is a debugging utility in Solaris and FreeBSD to monitor the system calls used. It is used to trace call and useful debugging […]

{ 1 comment }

Q. I’ve just installed Ubuntu Linux on my computer. I’d like to know – how to shutdown Ubuntu box over ssh session? A. If you are not using GUI, you can run halt or shutdown command to powerdown box. shutdown command shutdown arranges for the system to be brought down in a safe way. All […]


I’m using Debian Linux for last 4 years. I’m not able to find out update-rc.d like command ( install and remove System-V style init script links) on Redhat enterprise Linux (RHEL 5). Can you specify equivalent command for the same task?


What is POSIX Shell under UNIX / Linux operating systems?