overview.png
位置环境变量
num1=$1
num2=$2
sum=$(($num1+$num2))
echo $sum
预定义变量
echo "para is : $*"
echo "para is : $@"
echo "para num: $#"
for i in "$*"
do
echo "The parameters are: $i"
done
for i in "$@"
do
echo "The parameters are: $i"
done
echo "Current : $$"
find / -name hello.sh &
echo "background : $!"
*后台进程号$!未实现
read语句
read -p "please input your name: " -t 3 name
echo $name
read -p "please input your password: " -s passwd
echo -e "\n"
echo $passwd
read -p "please input your sex [M/F]: " -n 1 sex
echo -e "\n"
echo $sex
