Removing one file type from a sub-directory
Via the command line
To delete one file type from the entire hard drive, or from one subdirectory: sudo find / -name “.DS_Store” -depth -exec rm {} ; The first / can be replaced with the full folder path.
.DS_Store can be replaced with any filename, or wild card, *.jpg for instance
How To: Redirect Linux display to OS X
Install Macports
Open X11 type: xhost + (allows incoming connections from ‘anywhere’)
for extra security add machine name or username ssh to linux machine and type: setenv DISPLAY “ip address”:0 or setenv DISPLAY “full hostname”:0 (Note setenv is a CSH command, you may need to switch shells)
replace ip address with the ip address of the machine you arer connecting from.
Launch program (such as Gimp) and start using it.
Command line copy between two Unix machines
Use the command: ditto -cv -V path | ssh username@remotehost ditto -x – remotepath
Replacing remotehost with the host name, and remotepath with the location the files are being copied too.
Checking Disk Usage in Unix
These two commands are used to check disk usage
Disk usage by user
Df –sh * sorts by folder and gives total size in mb/gb (linux) sorted by owner of the file
Checking disk usage
du -sh *
– by cding it to a specific directory, can check the files sizes in just that directory.
Troubleshooting a Mac – Boot Options
Every once in a while a Mac gets so messed up that it won’t even boot. It’ll sit at the Apple screen, turning away. Or it’ll kernal panic just as it hits the blue login screen.
From Apple’s Support Knowledge Base here is what you need to do.
Resetting PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Your computer’s PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
If you have an older PPC Model Mac such as a G5 or Powerbook there is an additional step which will help.
Boot into Open Firmware by holding down the ‘Command-Option-O-F’ keys from a cold start while the chime is being played. You will see a command-line screen…enter these commands:
1. At the Open Firmware prompt, type: reset-nvram
2. Press Return.
3. At the Open Firmware prompt, type: reset-all
4. Press Return.
Example:
0 > reset-nvram
Press Return
0 > reset-all
Press Return
The reset-all command should cause the computer to restart. If this occurs, you have successfully reset the Open Firmware settings.