Shell arithmetic

• expr only does integers:

           % expr 23 / 7
           3

• No problem, the GNU shell has a builtin arithmetic operator

• Which also does only integers:

           % echo $(( 23 / 7 ))
           3

• No problem, we can use bc:

           % echo 23 / 7 | bc  -l
           3.28571428571428571428

• Ah, that's better.

Next

Next