Some Linux Tricks

To do simple calculation you can use command ((…))

$ echo $(( 20 + 10 ))

30

Following are the basic math operator use in Linux.

+ perform addition

/ divide last two numbers

* perform multiplication

- perform substration

For more complex math , like floating point etc. use bc command

$ echo "scale=5; 5/3" | bc

1.66666

You can use ((…)) or bc command to convert hex values to decimal

$ echo $((0xff))

255

$ echo 'obase=10; ibase=16; FF' | bc

255

You should always use uppercase letters while using bc command

To convert decimal to hex:

$ echo 'obase=16; ibase=10; 255' | bc

FF

One of the most important command ‘units’you can use to do conversion

$ units -t '1mile' 'km'

1.609344

Hope you will enjoy this