user.txt and call_names.sh
[root@logstash ~]# cat user.txt
zhangsan
lisi
wangwu
zhaoliu
liqi
zhangtao
lilei
hanmeimei
agou
amao
[root@logstash ~]# cat call_names.sh
#!/bin/bash
while :
do
line=$(cat /root/user.txt | wc -l)
num=$[RANDOM%line+1]
sed -n "${num}p" /root/user.txt
sleep 5
clear
done
[root@logstash ~]#验证：
[root@logstash ~]# sh call_names.sh
zhangtao
lisi
......
[root@logstash ~]#
