#!/bin/bash
echo "I test fun"
echo "$0"
printf "a string, no processing:<%s>\n" "A\nB"

printf "a string, no processing:<%b>\n" "A\nB"

printf "www.runoob.com \a"
echo '按下 <CTRL-D> 退出'
echo -n '输入你最喜欢的网站名: '
:<<!
while read FILM
do
    echo "是的！$FILM 是一个好网站"
done
!
a=10
let "a=a+20"
echo "$a"
for((ii=0;ii<3;ii+=2));do
echo "this is $ii for"
done
defun(){
read num
echo "${num}"
}

defun