This tutorial discusses the Linux find command, which helps locate files based on attributes like name, permissions, size, and owner. It describes common uses like finding files owned by a user or with suid bits. The key flags and options for find are explained, such as -type to specify file type, -name for filename matching, and -size to filter by file size in bytes, kilobytes, or megabytes. Examples are provided to search the home directory for text files sized 20 bytes and to combine flags to find all 20-byte text files in the /usr directory. More advanced techniques will be covered in a future part 2 focused on penetration testing and privilege escalation.

1. ​ ​ ​Find Tutorial
In this tutorial we are going to discuss one of the most important commands in linux that is
Find.
Uses:
● Helps in finding the files using names,permissions,size
● Helps in finding the files owned by a specific user and also helps in finding files with
suid bits.
● Helps in finding the files which are modified previously.
Most importantly it is very useful in the Privilege Escalation part in our Penetration testing.
Till now we have learned what are the uses of find command now we will discuss some
examples so that we get clear understanding about find command.
Syntax: ​ find filename
Ex: find cyber.txt
Now I will tell you the most important flags and options we are going to use with find
command.
Just learn the below flags and don't worry about examples. I will clearly explain how to use
them after explaining flags.
-type : d,f

2. This flag is used to specify the file type.
● For example if you are searching for directory then we will write ​-type d
● If we are searching for the file type the we use ​-type
-name :
This flag lets us search a file using file name or the words that contain in the file name.
Ex: finding a file having name .txt at the end ​ -name “*.txt”
-size: m,k,c
This flag is used to search the file with the help of the size of that file.
Options:
M for Mibs
K for kibs
C for bytes
Ex: finding a file having size 10 bits ​-size 20c
Till​ now we have learned about the flags and options.Now comes the interesting part of
practical execution.
To search a directory we need to use “/” after find command.
Some Examples:
● To search in the home directory : find /home …
● To search in /usr/bin directory : find /usr/bin...
● To search in the root directory then : find /root ..
No​w we will combine all our flags to get the desired result.
See you just need to remember this while writing the command:
Where to search[Directory]
What to search[File specifications]
Example 1 : Finding a file in /home directory having last name “*.txt”
Now we need to search in /home dir then search for file type after finding file type then
we are going to find out using file name.
Command: ​ find /home -type f -name “*.txt”
Check the Screenshots for more understanding.

3.
So in the above pic you can see 1.txt in /home directory.
In the above picture you can see the result .txt file in /home directory.
Now we will do some search based on size
Ex : Finding a file in home directory having size 16 bytes.
Simple as the above command just replace -name with -size and its option.
(Note: Here the question is to find file according to size but didn’t ask about name of file so
we are not using name flag here)
Command: ​ find /home -type f -size 16c
So till now we have searched for files using name and size.Now we will combine them to
get more desired output.

4. Ex: Suppose I want to find all the “.txt” files with the size of 20 bytes in /usr directory.
Now here we don't need to do anything new just combine the flags.
Command: ​find /usr -type f -size 20c -name “*.txt”
Till now I have explained to you the basic level of using find command. I don’t want this
blog to be lengthy.So, I will make part 2 with some advance level which is helpful while
doing pentesting and privilege escalation.
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