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Bash Shell Programming HowTos

Tutorials, howtos and programming tips about GNU Bourne-Again SHell (BASH) for Apple OS X, Linux, *BSD and Unix like operating systems. ( rss feed )

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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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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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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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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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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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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