Mac OSX

1. Reset Launch Services under Snow Leopard:(duplicate entries open with problem): http://www.thexlab.com/faqs/resetlaunchservices.html#Anchor-Reset-47857
2. Mice click: Ctrl-click(right click), option-click(middle click).
3. Ctrl-Command H: for highlighting in preview.
4. change hostname: sudo scutil --set HostName larryx.local
5. How to move dashboard widgets to desktop: http://macs.about.com/od/usingyourmac/qt/widgetondesktop.htm
   
6. Switch to root: 

   sudo su - 

7. Count lines: 

   $ wc -l myFileNameWithExtension

8. .DS_store: is a proprietary format hidden file created by Apple Inc.'s Mac OS X operating system to store custom attributes of a folder such as the position of icons or the choice of a background image.
9. Set default bash editor:

   // in .profile file write:
   VISUAL=emacs; export VISUAL
   EDITOR=emacs; export EDITOR

10. Clean up App store cache for some issue:

    open $(getconf DARWIN_USER_CACHE_DIR)
    # or 
    open $TMPDIR../C/

11. Marvericks Upgrades Issue: missing icon from dashboard:
    • go to "~/Library/Application Support/Dock",you can find file *.db, delete it,and open a terminal window ,input "killall  Dock",and all icons return
12. workaround_the_iconservices_bug_mavericks.sh:

    #!/bin/sh
    mkdir ${TMPDIR}/com.apple.IconServices

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