Python – Pexpect 套件

測試環境為 CentOS 8 x86_64 (虛擬機)

Pexpect 使用上蠻像之前常用的 TeraTerm Marco – https://benjr.tw/20386 , 透過 Pexpect 套件可以跟其他程式互動,基本上就3個動作

1. 呼叫程式.
2. 等待程式關鍵字.
3. 傳送字串.

安裝所需套件.

[root@localhost ~]# pip install pexpect

[root@localhost ~]# python3
Python 3.6.8 (default, Mar 25 2022, 11:15:52)
[GCC 8.5.0 20210514 (Red Hat 8.5.0-10)] on linux
Type "help", "copyright", "credits" or "license" for more information.

範例參考 – https://pexpect.readthedocs.io/en/stable/api/pexpect.html

手動執行指令步驟如下:
先產生測試所需檔案.

[root@localhost ~]# touch empty.py
[root@localhost ~]# ll empty.py
-rw-r--r-- 1 root root 0 Mar 15 16:03 empty.py

透過 scp 複製檔案到遠端 (使用 -o StrictHostKeyChecking=no 自動同意遠端的簽章)

[root@localhost ~]# scp -o StrictHostKeyChecking=no empty.py root@192.168.31.132:/root/pepect1.py
Warning: Permanently added '192.168.31.132' (ECDSA) to the list of known hosts.
root@192.168.31.132's password:
empty.py                                                                              100%    0     0.0KB/s   00:00

檢視遠端 IP:192.168.31.132 檔案.

[root@localhost ~]# ll pepect1.py
-rw-r--r-- 1 root root 0 Mar 15 16:08 pepect1.py

透過 pexpect 完成剛剛手動步驟.

import pexpect
child = pexpect.spawn('scp -o StrictHostKeyChecking=no empty.py root@192.168.31.132:/root/pepect2.py')
child.expect('password:')
child.sendline('111111')

檢視遠端 IP:192.168.31.132 檔案.

[root@localhost ~]# ll pepect2.py
-rw-r--r-- 1 root root 0 Mar 15 16:10 pepect2.py

程式說明:

1. 呼叫程式.

   child = pexpect.spawn('scp -o StrictHostKeyChecking=no empty.py root@192.168.31.132:/root/pepect2.py')
   

2. 等待程式關鍵字.

   child.expect('password:')
   

3. 傳送字串.

   child.sendline('111111')