Problem: How to see the process id of a process
ps Command will return the process id of named
# ps
PID TTY TIME CMD
2041 ? 00:00:00 named
Problem: How the view the virtual memory status?
# vmstat will show the virtual memory status
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 29084 3536 3296 44380 1 13 76 29 137 303 4 1 95
Network related
Problem: How will you know which ports are open in your linux server?
#nmap localhost
Port State Service
22/tcp open ssh
25/tcp open smtp
80/tcp open http
106/tcp open pop3pw
110/tcp open pop – 3
111/tcp filtered sunrpc
135/tcp filtered loc – srv
139/tcp filtered netbios – ssn
143/tcp open imap2
Nmap run completed – – 1 IP address (1 host up) scanned in 8 seconds
Problem: How to view the port number and protocol of service
# vi /etc/services
Problem: How to add another super user (as root)
#user add isp set up
#vi /etc/passwd
isp set up 😡 : 0 :0 :root :/root:/bin/bash
Problem: How to login without a password
#adduser test
#passwd test – d
——————– Thanks Everyone
2 Comments
I learn in Linux so your sharing post is good for me…… so thanks
It was a helpful post fro me too.Thank you sir for sharing this knowledge…….