To change the default file format of screen captures taken on your mac, you have a couple of different options. The quickest of them is using the Terminal app. To change the default format, use the following command.
defaults write com.apple.screencapture type format
You can replace format with any of the following formats: png, gif, bmp, jpeg, jpeg 2000, pdf, psd, sgi, tiff, pict, or tga.
Another option, if you’re not comfortable using the terminal, is to use the excellent maintenance program, OnyX.
First, fire up OnyX, then click the Parameters button in the toolbar. About halfway down on the right side, you’ll find the Screen Capture Format control, circled in red below. Select your desired format from the popup menu, then exit OnyX.

That’s all there is to it!
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I like to have one of my favorite quotes displayed each time I open a new Terminal window. It’s pretty easy to do this, and I’m going to show you how.
First, you’ll need to open your Terminal app, which is located in the Utilities folder. To get there quickly, hit Command-Shift-U while in Finder. This will open the Utilities folder. Now open up Terminal.
Next, you need to open the /etc/motd file in vim. Type the following command at the prompt and hit return:
sudo vim /etc/motd
You’ll be prompted for your password, and after you enter it you’ll be presented with the motd document. If there’s anything in there, tap the Esc key, then double tap the D key to remove the existing text line by line. If there are multiple lines, keep double tapping D until the document is cleared.
Now, hit Esc then the A key. This will enter insert mode. Insert a blank line by hitting return, then enter the text you wish to be displayed. Make sure to leave a blank line at the end as well. When you’ve finished, hit Esc then hold Shift and double tap Z. This will save and exit.
Hit Command-Q to quit terminal, then reopen it and you’ll see your banner text at the top of the window above the prompt, as shown below:

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