Disable startup items in Mac OSX

To disable per user startup items go to System Preferences > Users and Groups, then click on Login Items. To disable a startup item, simply uncheck the checkbox next to the item you want to disable. To add a new startup item, click on the + (plus) sign.

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Take screenshot on Mac OS X

Mac OS X has several built-in shortcuts to take screenshots. Since Mac OS X 10.4 (Tiger) screenshots are saved in png format.

• Take screenshot of  the whole screen
  Command + Shift + 3
• Take screenshot of selected area
  Command + Shift + 4 > select area
• Take screenshot of a selected Window
  Command + Shift + 4 > press Space > select Window

Screenshot files will be saved on the Desktop.

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Open Windows (SMB) share on Mac OS X

To open Windows share on Mac OS X:

• Open Finder
• Go > Connect to Server
  
  

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Show Hidden Files on Mac OS X

To show hidden files and folders on Mac OS:

• Open terminal
• Run following command:
  defaults write com.apple.Finder AppleShowAllFiles YES
• Relaunch Finder
  Press Alt + Right Click on Finder icon > Relaunch

Read more: Show Hidden Files on Mac OS X