I'm using a serial terminal to provide input into our lab experiment. I found that using
$ echo "5X5"
just returns a string of "5X5". Is there a command to execute a multiplication operation?
ベストアンサー1
Yes, you can use bash's built-in Arithmetic Expansion $(( )) to do some simple maths
$ echo "$((5 * 5))"
25
Check the Shell Arithmetic section in the Bash Reference Manual for a complete list of operators.
For sake of completeness, as other pointed out, if you need arbitrary precision, bc or dc would be better.