View source for Commands Line Utilities

= Process =
* Find PID of a known program.
<pre>
pidof <application name>
</pre>

* Find all the direct and indirect child processes of a process.
<pre>
pstree -p <PID>
</pre>

* List all the files opened by a process with PID.
<pre>
lsof -p <PID>
</pre>

* Find details of a file descriptor corresponding to a PID.
<pre>
lsof -p <PID> -a -d <FD>
</pre>
::- -a => Stands for 'AND' Operation.
::- -d => File descriptor for which we need to find details.

* Find Parent (PPID) of a process with PID.
<pre>
</pre>

= File System =
* Check filesystem type.
<pre>
df -T <Path>
</pre>

* See details about a mount.
<pre>
findmnt -T <Path>
</pre>

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 =