Skip to main content

How to change default shell from dash to bash in ubuntu

Ubuntu 6.10 onwards the default shell was changed from bash to dash. If we want the bash to be the default shell in Ubuntu  then following command will reset it back to bash shell safely.

# sudo dpkg-reconfigure dash


Popular posts from this blog

How to disable USB ports on Mac OS X Mavericks, Yosemite or El Capitan ?

We might wonder how to disable the USB ports on Mac to prevent data copy to external USB mass storage devices. The USB kext on os x is loaded at the time of start of the system, this can be loaded / unloaded using kextload or kextunload command. To disable USB port on Mac , follow below steps:
On Macs running Mountain Lion, Mavericks  and Yosemite:
Unmount any connected USB devices to the system by running below command                  $diskutil unmount /Volumes/USBDISK.Now unload the USB related kernel extensions in the following order using kextunload command.sudo kextunload -b
sudo kextunload -b
sudo kextunload -b

       This will unload the USB kext and disable the USB ports for storage devices on Mountain Lion, Mavericks  and Yosemite.
On Mac running El Capitan:
Unmount any connected USB devices to the system by running below command                  $diskutil unmount /Volumes/USBDI…

How to find firmware or boot ROM version in Mac OS X

Firmware and boot ROM version of your mac can be found in two ways.
Way 1 :
1. From "Apple" menu , choose "About This Mac" menu item. 2. Click " More Info " to open "System Profiler" application. 3. Under Contents -> Select Hardware Tree item.
On the right side panel Under hardware overview section, we can see Boot ROM Version and SMC (Firmware) Version.

Way 2 :
Run the below command in terminal to get boot ROM version and SMC(firmware) version :
$ system_profiler SPHardwareDataType | grep -i "Version" | awk -F ':' '{print $1 $2}'