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Objective: To pass parameters to the script and the basic budget
Ideas: first pass after the operation parameters
Parameter passing: two integers incoming command line, such as the $ bash demo.sh ab; shell script $ 1 and $ 2 for these two parameters
calculation: $ [] $ (() ) expr let
#!/bin/bash
#Date: 2019.01.19
#Author: TURF
#Mail: [email protected]
#Function: pass parameters to shell script to perform operations
#Version: 1.0
echo "The First para: $1"
echo "The First para: $2"
a=$1
b=$2
#求两个参数的和
echo "两个参数的和: "
echo "a + b = "$[ $a + $b ]
#求两个参数的差
echo "两个参数的差: "
echo "a - b = " $(( $a - $b )) "OR" "b - a = "`expr $b - $a`
#求两个参数的积
echo "两个参数的积: "
echo "a * b = " $(($a*$b))
#求两个参数的商
echo "两个参数的商"
echo "a / b = " $(( $a / $b )) "OR" "b / a = "`expr $b / $a`$ Bash demo.sh in the command input line 23 to give the following results
First para of The: 2
of The First para:. 3
two arguments:
A + B =. 5
two difference parameters:
A - B = B -1 OR -. 1 = A
product of two parameters:
A = B *. 6
Suppliers for two parameters
a / b = 0 OR b / a = 1