近期shell命令记录

netstat -nputw

• list all ports available on a server

netstat -tunlp
-t Show TCP ports.
-u Show UDP ports.
-n Show numerical addresses instead of resolving hosts.
-l Show only listening ports.
-p Show the PID and name of the listener’s process.

• scan for open ports and only list port 22

netstat -tnlp | grep :22

• view all listening ports on Ubuntu

ss -tunlp

• list all listening TCP ports 

lsof -nP -iTCP -sTCP:LISTEN

ll /proc/<pid>/exe

ps -ef | grep <pid>

cat /proc/<pid>/environ

• 如何查看 Linux 中所有正在运行的服务(https://blog.csdn.net/Pipcie/article/details/82586151)

service --status-all | more

•  linux查看开机启动项目 （https://blog.csdn.net/zyddj123/article/details/82497640）

systemctl list-unit-files

参考:

https://unix.stackexchange.com/questions/94357/find-out-current-working-directory-of-a-running-process

https://www.runoob.com/w3cnote/linux-check-port-usage.html

https://blog.csdn.net/liuxiao723846/article/details/91042025

https://lyceum-allotments.github.io/2017/03/python-and-pipes-part-6-multiple-subprocesses-and-pipes/

https://stackoverflow.com/questions/3190825/saving-stdout-from-subprocess-popen-to-file-plus-writing-more-stuff-to-the-file