shell脚本--01处理用户输入

#!/bin/bash
#using one command line parameter
#循环
#
factorial=1
for ((number = 1; number <= $1 ; number++))
do
    factorial = $[ $factorial * $number ]
done
echo The factorial of $1 is $factorial

$ ./test1/sh 5
The factorial of 5 is 120

#!bin/bash
#Testing a Multi-function script
#条件
#
name=$(basename $0)
#
if [ $name = "addem" ]
then
    total=$[ $1 + $2 ]
elif [ $name = "multem" ]
then
    total=$[ $1 * $2 ]
fi
#
echo The calculated value is $total

$ ./addem 2 5
The calculated value is 7
$ ./multem 2 5
The caloulated value is 10

#!bin/bash
#testing parameters before use
#判断参数存在吗
#
if [ -n "$1" ]
then
    echo Hello $1, glad to meet you.
else
    echo "Sorry,you did not identify yourself"
fi

$ ./tst.sh Rich

Hello Rich ,glad to meet you.