OSX Tips


This is needed if you want to serve AFP from your linux machine.

$ sudo aptitude update

$ mkdir -p ~/src/netatalk

$ cd ~/src/netatalk

$ sudo aptitude install cracklib2-dev libssl-dev

$ apt-get source -t testing netatalk

$ sudo apt-get build-dep netatalk

$ cd netatalk-2.X.X

$ sudo DEB_BUILD_OPTIONS=ssl dpkg-buildpackage -us -uc

$ sudo debi

$ echo "netatalk hold" | sudo dpkg --set-selections

After this, you’ll have a file server capable of AFP for OSX systems.

.AppleDouble Files

If you have problems with .AppleDouble files in your server, wherever you installed the netatalk binaries, there’s a script called cleanappledouble.pl which will clean up any orphaned entries in .AppleDouble directories.

$ ./cleanappledouble.pl --help

Usage: ./cleanappledouble.pl [-r] [-v] directory [directory ...]

Scans each directory and:

  1. removes orphaned .AppleDouble files (from /.AppleDouble)

  2. fixes permissions on .AppleDouble files to match corresponding data file (minus x bits)

  3. fixes owner/group of .AppleDouble files to match corresponding data file (root only)

If you need to delete the folders, you can try something like

find . -name \.AppleDouble -exec rm -rf {} \;

Create .iso images on OSX

From the Command Line:

Show Status

$: drutil status
Vendor   Product           Rev
Type: CD-ROM               Name: /dev/disk1
Sessions: 1                  Tracks: 1
Overwritable:   00:00:00         blocks:        0 /   0.00MB /   0.00MiB
Space Free:   00:00:00         blocks:        0 /   0.00MB /   0.00MiB
Space Used:   46:37:04         blocks:   209779 / 429.63MB / 409.72MiB

Unmount Disk

$: diskutil unmountDisk /dev/disk1

Unmount of all volumes on disk1 was successful

Create disk Image

$: dd if=/dev/disk1 of=image.iso  
963672+1 records in
963672+1 records out
493400208 bytes transferred in 220.611582 secs (2236511 bytes/sec)

Mount Disk Image

$ hdid image.iso

Change Background Login Image

cd /System/Library/CoreServices
sudo mv DefaultDesktop.jpg DefaultDesktop_org.jpg
sudo cp /Path/to/picture/you/want/to/use/image.jpg DefaultDesktop.jpg


Resize Image

$: convert -resize 50% image.png small.png

ImageMagick Command Line Options are here

Identify image information via CLI

$: identify -format '%wx%h' 001_small.jpg
** 399x262 (result) **

Adding network routes in OSX

route version in OSX is a bit old, and does not work same as LINUX. Adding a new route in your Mac is as follows:

route -n add -net  This adds network access to network through gateway with netmask.

Now we just want to route to a certain IP address.

route add -host

This IP is not accessible through the default network gateway, so we add this route over another gateway to access it.



top -ocpu -F -R -l2 -n20 | tail -n21 | grep -v `0.0% ..:` | cut -c 1-24,25-29,103-112


uptime | awk '{print "UPTIME : " $3 " " $4 " " $5 }' | sed -e 's/.$//g'; top -l 1 | awk '/PhysMem/ {print "RAM : " $8 " "}' ; top -l 2 | awk '/CPU usage/ && NR > 5 {print $6, $7=":", $8, $9="user ", $10, $11="sys ", $12, $13}'


File: ~/bin/ipaddress.sh

#! /bin/bash
myen0=`ifconfig en0 | grep "inet " | grep -v | awk '{print $2}'`

if [ "$myen0" != "" ]
    echo "Ethernet : $myen0"
    echo "Ethernet : INACTIVE"

myen1=`ifconfig en1 | grep "inet " | grep -v | awk '{print $2}'`

if [ "myen1" != "" ]
echo "AirPort  : $myen1"
echo "Airport  : INACTIVE"


echo External IP: `curl -s http://checkip.dyndns.org/ | sed 's/[a-zA-Z<>/:]//g'`


cal | sed "s/^/ /;s/$/ /;s/ $(date +%e) / $(date +%e | sed 's/./#/g') /"


uptime | awk '{printf "Uptime: " $3 " " $4 " " $5 " " }'; top -l 1 | awk '/PhysMem/ {printf "RAM : " $8 ", " }' ; top -l 2 | awk '/CPU usage/ && NR > 5 {print $6, $7=":", $8, $9="user", $10, $11="sys", $12, $13}'

TimeMachine LOG view

grep backupd /var/log/system.log | sed s_/System/Library/CoreServices/__g | tail -n 3

Networked TimeMachine Backup process

  1. Create TM backup disk image.

First get your MAC address from your card and create disk image with hdiutil.

ifconfig en0 |grep ether
hdiutil create -size 120g -fs HFS+J -volname "Jacintosh Backup" jacintosh_000008000469.sparsebundle
  1. Enable Unsupported Network Volumes

     defaults write com.apple.systempreferences TMShowUnsupportedNetworkVolumes 1
  2. Mount the NAS share the sparsebundle  and copy sparsebundle image to it.

     rsync -avE jacintosh_000008000469.sparsebundle /Volumes/TMBackups/.
  3. umount and mount again remote sparsebundle.

  4. Go to TimeMachine and select new remote image disk.

  5. Create your first backup.

  6. If you think Time Machine backs up too often

     sudo defaults write /System/Library/LaunchDaemons/com.apple.backupd-auto StartInterval -int 1800

Start Time Machine backups now in Terminal. **

tmutil startbackup

Start screen sharing remotely in Terminal

Assume you want to do some work on a remote Mac via 10.5’s Screen Sharing, but you forgot to enable Screen Sharing before you left the remote Mac. You’re now a good distance away, and apparently stuck. Fortunately, because the screen sharing system uses launchd to monitor its state, enabling and disabling is as simple as adding a file in the remote Mac’s /Libary/Preferences folder. (Note that you’ll need to be able to login to the remote Mac via ssh to run these commands on that Mac.)

$ cd /Library/Preferences
$ echo -n enabled > com.apple.ScreenSharing.launchd_

To disable screen sharing:

$ cd /Library/Preferences $ rm com.apple.ScreenSharing.launchd_

If you have a Finder window open with the remote Mac selected in the Shared section, you’ll even note the icon for Screen Sharing coming and going as you do this.

if !( groups | grep -q admin );
echo "Must be admin to run this script" exit 1 fi case "$1" in status)
[[ -e $LAUNCHD_FILE ]];
then echo 'Screen Sharing is enabled';
exit 0;
else echo 'Screen Sharing is not enabled';
exit 1 fi ;; start)
echo -n enabled > $LAUNCHD_FILE ;; stop) rm -f $LAUNCHD_FILE ;; *) 	
echo "Usage: $0 {status|start|stop}"

Now, to add a bunch of buttons that are also found in Apple Remote Desktop, type in this command (it is one line):

defaults write com.apple.ScreenSharing \'NSToolbar Configuration ControlToolbar' -dict-add 'TB Item Identifiers' \'(Scale,Control,Share,Curtain ,Capture,FullScreen,GetClipboard,SendClipboard,Quality)'

Useful tips


The rsync utility offers substantial improvements in performance when making backups of large file hierarchies.

To copy extended attributes with it, you must specify the -E flag. You can use rsync across a network to make centralized backups.

-E is just for the Mac OS X version of rsync 2.6.9, in the rsync 3 family, it is replaced by the -X flag.

Rebuild Spotlight index

sudo mdutil -s / (shows status)

sudo mdutil -i on / (activation)

rm -rf /.Spotlight*

sudo mdutil -E / (rebuild)

Little Script for autoindexing.

sleep 1 # let things settle down a bit
if mdutil -s "/Volumes/stuff" | grep -q "Indexing Disabled" ; 
mdutil -i on "/Volumes/stuff" >/dev/null

Get Mac serial number through command line 

ioreg -l | awk '/IOPlatformSerialNumber/ { print $4; }'

Get Mac Hardware info through command line

system_profiler | less

Dashboard Disable

defaults write com.apple.dashboard mcx-disabled -boolean YES

DNS Flush cache

sudo dscacheutil -flushcache