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• What does /dev/null mean in the shell?

  - by rishiag

  I've started learning bash scripting by using this guide: http://www.tldp.org/LDP/abs/abs-guide.pdf However I got stuck at the first script: cd /var/log cat /dev/null > messages cat /dev/null > wtmp echo "Log files cleaned up." What do lines 2 and 3 do in Ubuntu (I understand cat)? Is it only for other Linux distributions? After running this script as root, the output I get is Log files cleaned up. But /var/log still contains all the files.

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• What does /dev/null mean in a shell script?

  - by rishiag

  I've started learning bash scripting by using this guide: http://www.tldp.org/LDP/abs/abs-guide.pdf However I got stuck at the first script: cd /var/log cat /dev/null > messages cat /dev/null > wtmp echo "Log files cleaned up." What do lines 2 and 3 do in Ubuntu (I understand cat)? Is it only for other Linux distributions? After running this script as root, the output I get is Log files cleaned up. But /var/log still contains all the files.

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• Why I am getting following error when trying to start SDK manager?

  - by rishiag

  I have a 64 bit- 20 GB Ubuntu partition which has very less usable space. So I have put Eclipse in my Ubuntu and downloaded sdks to a folder in my another partition. So when I try to start sdk manager, I am getting the following error in my console: Unexpected exception 'Cannot run program "/media/Data/android-sdks/platform-tools/adb": error=13, Permission denied' while attempting to get adb version from '/media/Data/android-sdks/platform-tools/adb' I have run chmod recursively on android-sdks directory. If I change the address for sdks to Ubuntu partition, sdk manager starts successfully. Is there anything I can do other than increasing the partition size? Thanks

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