shell编程-交互 脚本菜单

[root@db ~]# cat echomen.sh 
#!/bin/bash
#simple script menu
function diskapace {
clear
df -k
}

function whoseon {
clear
who
}

function menusage {
clear
cat /proc/meninfo
}

function menu {
clear 
echo
echo -e "\t\t\t test menu"
echo -e "\t1. Display disk space"
echo -e "\t2. Display logged on users" 
echo -e "\t3. Display memory usage" 
echo -e "\t0. Exit menu\n\n"
#-en 选项会去掉末尾的换行符，这让菜单看起来更专业一些
echo -en "\t\tEnter option:" 
#read 命令读取用户输入
read -n 1 option
}

while [ 1 ]
do 
	menu
	case $option in
	0)
        break ;;
	1)
        diskapace  ;;
	2)
		whoseon ;;
	3)
		menusage ;;
	*)
		clear
		echo "sorry,wrong selection" ;;
	esac
	echo -en "\n\n\t\thit any to contunue"
	read -n 1 line
done
clear

运行：

			 test menu
	1. Display disk space
	2. Display logged on users
	3. Display memory usage
	0. Exit menu

		Enter option:

select variable in list
do
    commands
done

#!/bin/bash
#simple script menu
function diskapace {
clear
df -k
}

function whoseon {
clear
who
}

function menusage {
clear
cat /proc/meninfo
}

select option in "Display disk space" "Display logged on users" "Display memory usage" "Exit menu"
do 
	case $option in
	"Exit menu")
        break ;;
	"Display disk space")
        diskapace  ;;
	"Display logged on users")
		whoseon ;;
	"Display memory usage")
		menusage ;;
	*)
		clear
		echo "sorry,wrong selection" ;;
	esac
done
clear

运行：
# ./selectmeun.sh 
1) Display disk space	    3) Display memory usage
2) Display logged on users  4) Exit menu
#? 

#!/bin/bash
#test select option men 
menu=`ls -t /root/menu | cat | sed -n "1,8p"`

select option in ${menu} "Exit menu"
do
        echo ${option}
done

#ls /root/menu
test1  test2  test3  test4  test5  test6  test7  test8  test9

( -t ：用文件和目录的更改时间排序)
#ls -t /root/menu
test9  test8  test7  test6  test4  test5  test3  test2  test1

#./dynamicmenu.sh
[root@db ~]# ./men.sh 
1) test9      3) test7	    5) test4	  7) test3	9) Exit menu
2) test8      4) test6	    6) test5	  8) test2
#? 

如果删除一个文件或者增加一个文件，再次执行时菜单项就会变化
删除文件test3 、test5并且创建test10文件后再次执行脚本菜单变化了
1) test10     3) test8	    5) test6	  7) test2	9) Exit menu
2) test9      4) test7	    6) test4	  8) test1
#?