Useful OS X commands

useful-osx-commands.md

###Useful OS X commands

1. App Store Debug menu

   Show

   defaults write com.apple.appstore ShowDebugMenu -bool true
   

   Hide

   defaults write com.apple.appstore ShowDebugMenu -bool false
   

2. Remove extended attributes recursively

   xattr -rc <Folder>
   

3. Delete Time Machine backups

   sudo /System/Library/Extensions/TMSafetyNet.kext/Helpers/bypass rm -rfv /Volumes/<Disk>/Backups.backupdb/<Folder>/
   

4. Carbon copy a physical disk to an image (.dmg) file
   source: http://hints.macworld.com/article.php?story=20050302225659382

   dd bs=4096 if=/dev/rXX# of=/[TARGET DIR]/image.dmg conv=noerror,sync
   

   You have to dismount the partition first.
   Use the diskutil list and mount commands to discover the devices.

5. Convert .png images to .jpg

   sips -s format jpeg ./*.png --out jpg/
   

6. Resample image

   sips <source image> --resampleHeight <number> --out <directory>
   

7. Finder Error -10810

   http://www.thexlab.com/faqs/error-10810.html

   /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -seed -rfv
   

8. Query locked files

   lsof +c 0 | grep "\.Trash"
   

9. Flush and Reset All DNS Caches in OS X Yosemite 10.10.4

   via http://osxdaily.com/2014/11/20/flush-dns-cache-mac-os-x/
   From OS X 10.10.4 moving onward, including 10.11, Apple has ditched discoveryd and has replaced it (or rather, reverted back to) mDNSResponder. Thus, to clear DNS caches in OS X Yosemite 10.10.4, and 10.11 El Capitan, and presumably onward, the command string is as follows:

   sudo dscacheutil -flushcache;sudo killall -HUP mDNSResponder;say cache flushed
   

   That command flushes all DNS caches for OS X 10.10.4+.

10. Detailed Wi-Fi Connection History

    OS X Yosemite 10.10 and newer:

    defaults read /Library/Preferences/SystemConfiguration/com.apple.airport.preferences |grep LastConnected -A 7