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Quick command line math
expr will give you a quick way to do basic math from the CLI. Make sure you escape things like * and leave a space between operators and digits.

Delay execution until load average falls under 1.5
If shell escaping of the command is problematic, you can write the command to a file first: $ batch

Rename all images in current directory to filename based on year, month, day and time based on exif information

Installing True-Type fonts
First you have to create a directory in your system, where the fonts will be stored, and copy them. $ sudo mkdir /usr/share/fonts/miscttf; sudo cp *.ttf /usr/share/fonts/miscttf After recharge cache with the command

Using tput to save, clear and restore the terminal contents
Very useful for interactive scripts where you would like to return the terminal contents to its original state before the script was run. This would be similar to how vi exits and returns you to your original terminal screen. Save and clear the terminal contents with: $tput smcup Execute some commands, then restore the saved terminal contents with: $tput rmcup

Number of files in a SVN Repository
Number of files in a SVN Repository This command will output the total number of files in a SVN Repository.

list block devices
Shows all block devices in a tree with descruptions of what they are.

Find the modified time (mtime) for a file

total percentage of memory use for all processes with a given name
This command will add up RAM usage of all processes whose name contains "java" and output the sum of percentages in HRF. Also, unlike the original #15430, it wont fail on processes with a usage of >9.9%. Pleases note that this command wont work reliably in use cases where a significant portion of processes involved are using less than 0.1% of RAM, because they will be counted as "0", even though a great number of them could add up to significant amounts.

Download 10 random wallpapers from images.google.com


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