脚本库

#!/bin/bash

# myscript functions

function addem {
    echo $[ $1 + $2 ]
}

function multem {
    echo $[ $1 * $2 ]
}

function divem {
    if [ $2 -ne 0]
    then
        echo $[ $1/$2 ]
    else
        echo -1
    fi
}