[root@VM_96_242_centos ~]# vim ssh_key.exp

#############################################################
 # File Name: help.sh
 # Author: 寻音
 # E-mail: lnhxzwb@126.com
 # Created Time: Wed 25 Jan 2018 15:22:13 PM CST
 #=============================================================
#!/usr/bin/expect
set timeout 30
spawn ssh-keygen
expect ":"
send "\r"
expect ":"
send "\r"
expect ":"
send "\r"
expect eof
exit