Linux command line commands pdf

Linux Commands Cheat Sheet

Here in this cheat sheet, Linux commands are categorized into different sections according to its usage. It is designed with all the commands in a nice background color.

You will find both the pdf and image (png) format of the cheat sheet.

Cheat sheet

Download your Linux commands cheat sheet in pdf format and print the Linux command download cheat sheet in A4 size paper.

Please keep us posted if you have any suggestions or if you find any command that we missed out on.

1. System Based Commands

uname	Displays Linux system information
uname -r	Displays kernel release information
uptime	Displays how long the system has been running including load average
hostname	Shows the system hostname
hostname -i	Displays the IP address of the system
last reboot	Shows system reboot history
date	Displays current system date and time
timedatectl	Query and change the System clock
cal	Displays the current calendar month and day
w	Displays currently logged in users in the system
whoami	Displays who you are logged in as
finger username	Displays information about the user

2. Hardware Based Commands

dmesg	Displays bootup messages
cat /proc/cpuinfo	Displays more information about CPU e.g model, model name, cores, vendor id
cat /proc/meminfo	Displays more information about hardware memory e.g. Total and Free memory
lshw	Displays information about system’s hardware configuration
lsblk	Displays block devices related information
free -m	Displays free and used memory in the system (-m flag indicates memory in MB)
lspci -tv	Displays PCI devices in a tree-like diagram
lsusb -tv	Displays USB devices in a tree-like diagram
dmidecode	Displays hardware information from the BIOS
hdparm -i /dev/xda	Displays information about disk data
hdparm -tT /dev/xda	Conducts a read speed test on device xda
badblocks -s /dev/xda	Tests for unreadable blocks on disk

3. Users Management Commands

id	Displays the details of the active user e.g. uid, gid, and groups
last	Shows the last logins in the system
who	Shows who is logged in to the system
groupadd «admin»	Adds the group ‘admin’
adduser «Sam»	Adds user Sam
userdel «Sam»	Deletes user Sam
usermod	Used for changing / modifying user information

4. File Commands

ls -al	Lists files — both regular & hidden files and their permissions as well.
pwd	Displays the current directory file path
mkdir ‘directory_name’	Creates a new directory
rm file_name	Removes a file
rm -f filename	Forcefully removes a file
rm -r directory_name	Removes a directory recursively
rm -rf directory_name	Removes a directory forcefully and recursively
cp file1 file2	Copies the contents of file1 to file2
cp -r dir1 dir2	Recursively Copies dir1 to dir2. dir2 is created if it does not exist
mv file1 file2	Renames file1 to file2
ln -s /path/to/file_name link_name	Creates a symbolic link to file_name
touch file_name	Creates a new file
cat > file_name	Places standard input into a file
more file_name	Outputs the contents of a file
head file_name	Displays the first 10 lines of a file
tail file_name	Displays the last 10 lines of a file
gpg -c file_name	Encrypts a file
gpg file_name.gpg	Decrypts a file
wc	Prints the number of bytes, words and lines in a file
xargs	Executes commands from standard input

5. Process Related Commands

ps	Display currently active processes
ps aux | grep ‘telnet’	Searches for the id of the process ‘telnet’
pmap	Displays memory map of processes
top	Displays all running processes
kill pid	Terminates process with a given pid
killall proc	Kills / Terminates all processes named proc
pkill process-name	Sends a signal to a process with its name
bg	Resumes suspended jobs in the background
fg	Brings suspended jobs to the foreground
fg n	job n to the foreground
lsof	Lists files that are open by processes
renice 19 PID	makes a process run with very low priority
pgrep firefox	find Firefox process ID
pstree	visualizing processes in tree model

6. File Permission Commands

chmod octal filename	Change file permissions of the file to octal
Example
chmod 777 /data/test.c	Set rwx permissions to owner, group and everyone (everyone else who has access to the server)
chmod 755 /data/test.c	Set rwx to the owner and r_x to group and everyone
chmod 766 /data/test.c	Sets rwx for owner, rw for group and everyone
chown owner user-file	Change ownership of the file
chown owner-user:owner-group file_name	Change owner and group owner of the file
chown owner-user:owner-group directory	Change owner and group owner of the directory

7. Network Commands

ip addr show	Displays IP addresses and all the network interfaces
ip address add 192.168.0.1/24 dev eth0	Assigns IP address 192.168.0.1 to interface eth0
ifconfig	Displays IP addresses of all network interfaces
ping host	ping command sends an ICMP echo request to establish a connection to server / PC
whois domain	Retrieves more information about a domain name
dig domain	Retrieves DNS information about the domain
dig -x host	Performs reverse lookup on a domain
host google.com	Performs an IP lookup for the domain name
hostname -i	Displays local IP address
wget file_name	Downloads a file from an online source
netstat -pnltu	Displays all active listening ports

8. Compression/Archives Commands

tar -cf home.tar home	Creates archive file called ‘home.tar’ from file ‘home’
tar -xf files.tar	Extract archive file ‘files.tar’
tar -zcvf home.tar.gz source-folder	Creates gzipped tar archive file from the source folder
gzip file	Compression a file with .gz extension

9. Install Packages Commands

rpm -i pkg_name.rpm	Install an rpm package
rpm -e pkg_name	Removes an rpm package
dnf install pkg_name	Install package using dnf utility

10. Install Source (Compilation)

./configure	Checks your system for the required software needed to build the program. It will build the Makefile containing the instructions required to effectively build the project
make	It reads the Makefile to compile the program with the required operations. The process may take some time, depending on your system and the size of the program
make install	The command installs the binaries in the default/modified paths after the compilation

11. Search Commands

grep ‘pattern’ files	Search for a given pattern in files
grep -r pattern dir	Search recursively for a pattern in a given directory
locate file	Find all instances of the file
find /home/ -name «index»	Find file names that begin with ‘index’ in /home folder
find /home -size +10000k	Find files greater than 10000k in the home folder

12. Login Commands

ssh [email protected]	Securely connect to host as user
ssh -p port_number [email protected]	Securely connect to host using a specified port
ssh host	Securely connect to the system via SSH default port 22
telnet host	Connect to host via telnet default port 23

13. File Transfer Commands

scp file1.txt server2/tmp	Securely copy file1.txt to server2 in /tmp directory
rsync -a /home/apps /backup/	Synchronize contents in /home/apps directory with /backup directory

14. Disk Usage Commands

df -h	Displays free space on mounted systems
df -i	Displays free inodes on filesystems
fdisk -l	Shows disk partitions, sizes, and types
du -sh	Displays disk usage in the current directory in a human-readable format
findmnt	Displays target mount point for all filesystems
mount device-path mount-point	Mount a device

15. Directory Traverse Commands

cd ..	Move up one level in the directory tree structure
cd	Change directory to $HOME directory
cd /test	Change directory to /test directory

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About The Author

Bobbin Zachariah

Bobbin is a seasoned IT professional with over two decades of experience. He has excelled in roles such as a computer science instructor, Linux system engineer, and senior analyst. Currently, he thrives in DevOps environments, focusing on optimizing efficiency and delivery in AWS Cloud infrastructure. Bobbin holds certifications in RHEL, CCNA, and MCP, along with a Master’s degree in computer science. In his free time, he enjoys playing cricket, blogging, and immersing himself in the world of music.

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Linux Commands List Pdf

Linux is a free and open-source operating system that is based on Unix. It was originally developed by Linus Torvalds in 1991 and has since become one of the most widely used operating systems in the world, particularly on servers, supercomputers, and embedded systems. Linux is known for its stability, security, and flexibility, and its user base includes individuals, small organizations, and large corporations. Linux also provides users with a wide range of software and tools, including office applications, web servers, programming languages, and games. Additionally, Linux is highly customizable and can be adapted to meet the specific needs of its users.

Linux commands are instructions that are used to interact with the operating system. Some common Linux commands include:

Linux Commands List Pdf – Basic Commands

Command	Description
pwd	prints the current working directory
cd	allows one to change directory
ls	lists the contents of a directory
alias	create a shortcut to another command or name to execute a long string.
mkdir	create a directory
cp	copy a file or directory
rm	removes or deletes a file or directory
mv	moves or renames a file or directory

Linux Commands List Pdf – Directory Navigation and Listing

Command	Description
cd	change to home directory
cd ..	go up to parent directory
cd subdir	change to subdirectory subdir
ls	list content of current directory
ls -l	list content with details
ls -a	list content including hidden files

Linux Commands List Pdf – File Commands

cp src dest	copy src file to dest file
cp -r sDir dDir	copy “recursively” sDir directory to dDir directory (copies subdirectories too)
mv src dest	move – renames src as dest
rm fileName	removes file fileName
rm -r dirName	removes directory recursively
rmdir dirName	removes empty dirName
mkdir dirName	makes directory called dirName
chmod 750 file1	change permission of file1 by specifying a three digit octal # where digits are owner, group, world each octal digit in binary are: read (4) ,write (2) ,execute (1)
cat file1	display file1 to screen
less file1	display file1 with pagination (space – next page, q-exit, ↑,↓- keys)

Process Management

Keyboard Shortcuts

	Auto-complete partial file name
+ c	Kill current command/program
+z	Sleep current program
	Recall previous command(s)
+d	log-off and close terminal

Linux Commands List Pdf – Other Commands

• passwd: change password
• chsh: change default shell
• df: report disk space usage by filesystem
• du: estimate file space usage – space used under a particular directory or files on a file system.
• sudo: run command as root (only if you have access)
• mount: mount file system (root only)
• umount: unmount file system (root only)
• shutdown: reboot or turn off machine (root only)
• top: Produces an ordered list of running processes
• htop: An interactive process viewer for Linux (not installed by default)
• free: Display amount of free and used memory in the system
• file: Determine file type
• touch: change file timestamps or create file if not present
• date: display or set date and time
• find : Find a file find /dir/to/search -name file-to-search
• wc: Count words, lines and characters in a file wc -l .bashrc
• grep: Find patterns in a file grep alias .bashrc
• awk: File processing and report generating awk ’’ file1
• sed: Stream Editor sed ’s/home/HOME/g’ .bashrc
• set: manipulate environment variables set -o emacs
• ln: Link a file to another file ln -s file1 file2
• head: Display first lines of a file head file1
• tail: Display last lines of a file tail file1
• wait: wait until all backgrounded jobs have completed
• which: shows the full path of (shell) commands
• whatis: display manual page descriptions

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