Default Folder Path For Screenshots On Mac OSX

Here shows how to change default file type of screenshots to JPG on Mac OSX. Another trick is how to change the default folder path that the captured screenshots are saved. Screenshots are saved on Desktop by default. I want to change it to "/Users/netlynker/Pictures/Screenshots". I type the following command in Terminal.

$defaults write com.apple.screencapture location /Users/netlynker/Pictures/Screenshots

I need to log out and log in again to make it affected immediately.
Now your screenshots will be saved in your preferred location in future.

Bash Command History with Time Stamps

Nomally, 'history' command will only show you the following output.
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   56  sudo find / -mtime 1

   57  sudo vi /etc/hosts

   58  ls

   59  shell

   60  ls

   61  ifconig

   62  ifconfig

   63  ls

   64  ls

   65  exit

   66  exit

   67  exit

   68  history

   Unix:~ netlynker$ 

==================================   

As you see, it doesn't show when these commands were executed. As an administrator, you need to know WHEN WHO did WHAT.  

To enable Time of execution in 'history' for existing users, we need to define the time format of 'history' in ".bash_profile" of each user.

#echo "export HISTTIMEFORMAT='%F %T '" >> ~/.bash_profile"

To enable it for new user account for future, we need to did the same thing to "/etc/profile"

#echo "export HISTTIMEFORMAT='%F %T '" >> /etc/profile"

Now when you run 'history' command this time, the output will be like the following:

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   69  2011-06-05 12:42:21 history 

   70  2011-06-05 12:48:21 cd /dev/

   71  2011-06-05 12:48:22 ls

   72  2011-06-05 12:48:29 ls -al tty*

   73  2011-06-05 12:48:36 cd /etc

   74  2011-06-05 12:48:38 ls hosts

   75  2011-06-05 12:48:41 ls -al hosts

   76  2011-06-05 12:48:48 visudo 

   77  2011-06-05 12:48:52 sudo visudo

   78  2011-06-05 12:49:06 vi /etc/hosts

   79  2011-06-05 12:49:13 ping 10.0.0.8

   80  2011-06-05 12:50:13 scp root@10.0.0.12:~/checkinstall* ~/Downloads/

   81  2011-06-05 12:50:27 history 

   Unix:~ netlynker$ 

==================================   

Cool! right?

Changing Captured Screenshot's Defult File Type In Snow Leopard

Every now and then, I need to capture screenshot on my computer to create how-to documents for my users. I notice that Mac OS X captures the screenshot into PNG format by default. I prefer JPG to PNG because of the smaller file size. Here is how to change default file type of screenshots in Mac Snow Leopard. 

$defaults write com.apple.screencapture type jpg

Then, U need to restart the UIServer.

$killall SystemUIServer

Now take some screenshots by shortcut (Command+Shift+3) and U will find captured jpeg files on Desktop.