Commands Line Utilities: Difference between revisions
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* Find Parent (PPID) of a process with PID. | * Find Parent (PPID) of a process with PID. | ||
<pre> | <pre> | ||
</pre> | |||
= File System = | = File System = | ||
| Line 37: | Line 38: | ||
ps -o ppid= -o comm= -p <PID> | ps -o ppid= -o comm= -p <PID> | ||
= Networking = | |||
= Host Command = | |||
<pre> | |||
pristal@personal-system:~$ host google.com | |||
google.com has address 142.250.196.14 | |||
google.com has IPv6 address 2404:6800:4007:829::200e | |||
google.com mail is handled by 10 smtp.google.com. | |||
pristal@personal-system:~$ | |||
</pre> | |||
* To get the nameservers associated with a domain, | |||
<pre> | |||
pristal@personal-system:~$ host -t ns google.com | |||
google.com name server ns2.google.com. | |||
google.com name server ns1.google.com. | |||
google.com name server ns3.google.com. | |||
google.com name server ns4.google.com. | |||
pristal@personal-system:~$ | |||
</pre> | |||
* To get the mailserver associated with a domain, | |||
<pre> | |||
pristal@personal-system:~$ host -t mx google.com | |||
google.com mail is handled by 10 smtp.google.com. | |||
pristal@personal-system:~$ | |||
</pre> | |||
::- Mail server is ''smtp.google.com'' | |||
::- Here the priority is set to ''10'' | |||
= Nslookup command = | |||
= NetCat Command = | |||
* nc | |||
= Dig Command = | |||
* dig | |||
= Nmap Command = | |||
= Curl Command = | |||
= Wget Command = | |||
Revision as of 13:14, 16 June 2025
Process
- Find PID of a known program.
pidof <application name>
- Find all the direct and indirect child processes of a process.
pstree -p <PID>
- List all the files opened by a process with PID.
lsof -p <PID>
- Find details of a file descriptor corresponding to a PID.
lsof -p <PID> -a -d <FD>
- - -a => Stands for 'AND' Operation.
- - -d => File descriptor for which we need to find details.
- Find Parent (PPID) of a process with PID.
File System
- Check filesystem type.
df -T <Path>
- See details about a mount.
findmnt -T <Path>
ps -o ppid= -o comm= -p <PID>
Networking
Host Command
pristal@personal-system:~$ host google.com google.com has address 142.250.196.14 google.com has IPv6 address 2404:6800:4007:829::200e google.com mail is handled by 10 smtp.google.com. pristal@personal-system:~$
- To get the nameservers associated with a domain,
pristal@personal-system:~$ host -t ns google.com google.com name server ns2.google.com. google.com name server ns1.google.com. google.com name server ns3.google.com. google.com name server ns4.google.com. pristal@personal-system:~$
- To get the mailserver associated with a domain,
pristal@personal-system:~$ host -t mx google.com google.com mail is handled by 10 smtp.google.com. pristal@personal-system:~$
- - Mail server is smtp.google.com
- - Here the priority is set to 10
Nslookup command
NetCat Command
- nc
Dig Command
- dig
