Shell四則運算

Shell四則運算

Shell四則運算，範例如下:

let_operations.sh

#!/bin/bash #Filename: let_operations.sh   #四則運算 value01=20 value02=4   #let只令可以直接執行運算操作 let value01++ let value02++ let letresult=value01+value02 printf "letresult=%d\n" $letresult   #使用[] result01=0 result01=$[ $value01 + $value02 ] printf "result01 +op=%d\n" $result01   result01=$[ $value01 - $value02 ] printf "result01 -op=%d\n" $result01   result01=$[ $value01 * $value02 ] printf "result01 *op=%d\n" $result01   result01=$[ $value01 / $value02 ] printf "result01 /op=%d\n" $result01   #使用(()) result02=0 result02=$(( $value01 + $value02 )) printf "result02 +op=%d\n" $result02   result02=$(( $value01 - $value02 )) printf "result02 -op=%d\n" $result02   result02=$(( $value01 * $value02 )) printf "result02 *op=%d\n" $result02   result02=$(( $value01 / $value02 )) printf "result02 /op=%d\n" $result02   #浮點數運算 c=$(echo "5.01-4*2.0"|bc) printf "c =%f\n" $c c=$(awk 'BEGIN{print 7.01*5-4.01 }') printf "c =%f\n" $c

 

參考出處:Linux Shell 腳本攻略 P9