Linux Command Intro

Cheatsheet perintah-perintah dasar Linux

Catatan ini ditujukan untuk mempermudah pencarian perintah-perintah dasar Linux untuk keperluan Pentesting/VA.Cheatsheet ini disadur dari akun Github rekan saya Satrya Mahardhika.

whoami

Print active User ID

whoami

pwd

Print Working directory

pwd

mkdir

Make Directory

mkdir pentest/

cd

Change directory

cd pentest // Change directory to pentest (Inside Working Directory)
cd /var // change directory to var (Outside Working Directory)
cd //Back to home Directory
cd .. // Directory Up

ls

List files in working Directory

ls
ls -la // Print out all files including hidden files

which

Locate executable file full path

which nmap // Locate the full path of nmap  

man

Manual Page of a Command

man which // Manual page of which Command
man -K "change password" // Search for command to change password

locate

Find / Search for files

locate -i passwd // Find for passwd files with case-Insensitive

wget

Download a file

wget http://<IP>:<Port>/access_log.txt

cat

Concatenate / print contents of a files

cat access_log.txt

head

Cat only first 10 lines of a file

head access_log.txt

tail

Cat only last 10 lines of a file

less access_log.txt

cp

Copy file

cp access_log.txt access_log.txt.backup

mv

Rename or cut a file

mv access_log.txt exercise.txt

grep

Search for specific word in a file

grep admin exercise.txt

wc

Count lines, words, bytes, of a files

wc exercise.txt

sort

Sort files

sort -u exercise.txt // Sort unique lines on exercise.txt

tab completion

Automatically fill the command/files names we write

cat ex<TAB> // will show exercise.txt

history

Check history of command we input

history

sudo

Super User do!

cat /etc/shadow // It will prompt Access Denied
ls -la /etc/shadow // Check permission of /etc/shadow file
whoami
sudo -l // Check our sudo privilege
sudo /etc/shadow
cat /etc/shadow
sudo !! // Sudo above command

su

switch user

su kali // Switch to kali
sudo su // Switch to root

Piping & Redirection

Piping ( | ) is a command that let you use two or more commands such that output of one command serves as input to the next command.

cat exercise.txt // Will show all lines of exercises.txt
cat exercise.txt | grep admin // will only show line contain admin
cat exercise.txt | grep admin | wc -c // Count bytes of above output

Redirection is change the output of command to a files

cat exercise.txt | grep admin > admin_exercise.txt
echo "This will overwrite" > admin_exercise.txt | Overwrite exercise.txt with "This will overwrite", or make exercise.txt file if it is not exists
echo "This will not overwrite" >> admin_exercise.txt | write "This will not overwrite" to the last line of exercise.txt

cut

Cutting out some section of a file

cat user.txt | cut -d ":" -f 1 //Menampilkan hanya colomn 1

awk

More powerful than Cut

cat user.txt | awk -F ":" '{print $1 $2}'
cut user.txt | awk -F ":" '{print "Terdapat user bernama " $1}'