putty提示这个“warning”之后，如何退回到newAgent？

Question

login as: root
root@10.1.89.156's password:
Access denied
root@10.1.89.156's password:
Last login: Wed Nov 28 17:45:40 2018 from 10.2.163.161
[root@web ~]# cd /home/was/newAgent
[root@web newAgent]# n
-bash: n: command not found
[root@web newAgent]# cd newAgent.log
-bash: cd: newAgent.log: Not a directory
[root@web newAgent]# tail -f
tail: warning: following standard input indefinitely is ineffective
^C
cd /
^[^[^[i