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Unix Tagged Q & A

Question and answer for users of Unix-like operating systems. Topic includes – Unix commands, servers, security, networking, shell programming, troubleshooting and much more ( rss feed ).

How To: Restart Apple Mac OS X Airport Networking From the Bash Terminal

How do I enable and/or disable networking (AirPort) Ethernet and Wireless from the bash command Line in Apple Mac OS X? How can I restart Wi-Fi via command Line in OS X?
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How to Prevent & Disable Mac OS X From Sleeping From the Command Line Terminal Application

I‘m running a process to complete backup and covert images in Mac OS X laptop. I do not wish to disable sleep manually from my OS X power options (Energy Saver). How do I temporarily prevent a Mac from sleeping while my process is still active in Mac OS X Unix operating systems? How can I prevent the system from sleeping temporarily from the command prompt?
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I‘m looking to install pfSense 2.2.x and I would like to install it on a hard disk drive rather than CF (compact flash). How can I install hard disk install via serial console on the soekris net5501 server?
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How To Find My Public IP Address From Command Line On a Linux

How do I find out my public IP address on the Linux and OS X Unix command line to use with my own bash shell script without using third party web site? Is there command-line option which will show my dynamic IP address on a Ubuntu or Fedora Linux?
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Linux and Unix Test Disk I/O Performance With dd Command

How can I use dd command on a Linux to test I/O performance of my hard disk drive? How do I check the performance of a hard drive including the read and write speed on a Linux operating systems?
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FreeBSD Add a User To Wheel Group Command

How do I add a user to the wheel group in FreeBSD unix operating systems using command line options?
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How To Run Cronjob Script On The Last Day Of a Month

How to execute script on the last day of a month on Linux or Unix bash shell? How do I run a disk usage or custom reporting shell/perl/python script on the last day of a month on a Linux or Unix-like systems?
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How To: Temporarily Clear Bash Environment Variables on a Linux and Unix-like System

I‘m a bash shell user. I would like to temporarily clear bash shell environment variables. I do not want to delete or unset an exported environment variable. How do I run a program in a temporary environment in bash or ksh shell?
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How To Find the WiFi Password on Mac OS X

I‘ve MBP 13″ laptop. How can I find out the Wifi password on Mac OS X using command line and GUI options?
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Bash: Find out the exit codes of all piped commands

How do I get exit status of process that’s piped to another (for e.g. ‘netstat -tulpn | grep nginx‘) on a Linux or Unix-like system using a bash shell?
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