shell脚本实现九九乘法表

一、用shell实现打印九九乘法表

echo " 打印乘法表 ："
for (( i = 1 ; i <= 9 ; i = i + 1 ))
do
    for (( j = 1 ; j <= i ; j = j + 1 ))
do
    echo -n -en "$i * $j = $(( i * j))\t";
done
echo"";
done

[root@localhost test1]# bash 99.sh 
 打印乘法表 ：
1 * 1 = 1	
2 * 1 = 2	2 * 2 = 4	
3 * 1 = 3	3 * 2 = 6	3 * 3 = 9	
4 * 1 = 4	4 * 2 = 8	4 * 3 = 12	4 * 4 = 16	
5 * 1 = 5	5 * 2 = 10	5 * 3 = 15	5 * 4 = 20	5 * 5 = 25	
6 * 1 = 6	6 * 2 = 12	6 * 3 = 18	6 * 4 = 24	6 * 5 = 30	6 * 6 = 36	
7 * 1 = 7	7 * 2 = 14	7 * 3 = 21	7 * 4 = 28	7 * 5 = 35	7 * 6 = 42	7 * 7 = 49	
8 * 1 = 8	8 * 2 = 16	8 * 3 = 24	8 * 4 = 32	8 * 5 = 40	8 * 6 = 48	8 * 7 = 56	8 * 8 = 64	
9 * 1 = 9	9 * 2 = 18	9 * 3 = 27	9 * 4 = 36	9 * 5 = 45	9 * 6 = 54	9 * 7 = 63	9 * 8 = 72	9 * 9 = 81

二、判断web服务是否开启

1.查看80端口是否被监听

[root@localhost ~]# ss -an | grep 80

tcp   LISTEN     0      128                                                         *:80                      *:*    

2.查看80端口/httpd服务是否开启

[root@localhost ~]# netstat -lntup | grep 80
tcp6       0      0 :::80                   :::*                    LISTEN      3204/httpd 

[root@localhost ~]# netstat -lntup | grep httpd

tcp6       0      0 :::80                   :::*                    LISTEN      3204/httpd

3.查看本地进程

[root@localhost ~]# ps -ef | grep httpd
root        3204       1  0 20:28 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache      3207    3204  0 20:28 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache      3208    3204  0 20:28 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache      3209    3204  0 20:28 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
apache      3210    3204  0 20:28 ?        00:00:00 /usr/sbin/httpd -DFOREGROUND
root        3537    2983  0 20:37 pts/1    00:00:00 grep --color=auto httpd