50 Essential Linux Commands Every DevOps Engineer and Beginner Should Know
Whether you’re a beginner starting your Linux journey, a DevOps Engineer managing servers, or a System Administrator troubleshooting production environments, Linux commands are a skill you cannot avoid.
Most day-to-day tasks in Linux, such as navigating directories, managing files, monitoring processes, checking system resources, troubleshooting networks, and handling permissions, are performed using command-line tools. Learning these commands not only improves your productivity but also helps you become more confident when working with Linux-based systems.
In this article, we’ve compiled some of the most commonly used Linux commands along with simple explanations. These commands are widely used by Linux Administrators, DevOps Engineers, Cloud Engineers, and IT professionals in real-world environments.
Let’s get started and explore the essential Linux commands every professional should know.
Files and Navigating
ls – directory listing (list all files/folders on current dir)
ls -l – formatted listing
ls -la – formatted listing including hidden files
cd dir – change directory to dir (dir will be directory name)
cd .. – change to parent directory
cd ./dir – change to dir in parent directory
cd – change to home directory
pwd – show current directory
mkdir dir – create a directory dir
rm file – delete file
rm -f dir – force remove file
rm -r dir – delete directory dir
rm -rf dir – remove directory dir
rm -rf / – launch some nuclear bombs targeting your system
cp file1 file2 – copy file1 to file2
mv file1 file2 – rename file1 to file2
mv file1 dir/file2 – move file1 to dir as file2
touch file – create or update file
cat file – output contents of file
cat > file – write standard input into file
cat >> file – append standard input into file
tail -f file – output content of file as it grows
Networking
ping host – ping host
whois domain – get whois for domain
dig domain – get DNS for domain
dig -x host – resolve lookup host
wget file – download file
wget -c file – continue stopped download
wget -r url – recursively download files from url
curl url – outputs the webpage from url
curl -o home.html url – writes the page to me.html
ssh user@host – connect to host as user
ssh -p port user@host – connect using port
ssh -D user@host – connect & use bind port
Processes
ps – display currently active processes
ps aux – detailed outputs
kill pid – kill process with process id (pid)
killall proc – kill all processes named proc
System Info
date – show current date/time
uptime – show uptime
whoami – who you’re logged in as
w – display who is online
cat /proc/cpuinfo – display cpu info
cat /proc/meminfo – memory info
free – show memory and swap usage
du – show directory space usage
du -sh – displays readable sizes in GB
df – show disk usage
uname -a – show kernel config
Compressing
tar cf file.tar files – tar files into file.tar
tar xf file.tar – untar into current directory
tar tf file.tar – show contents of archive
Permissions
chmod octal file – change permissions of file
4 – read (r)
2 – write (w)
1 – execute (x)
order: owner/group/world
chmod 777 – rwx for everyone
chmod 755 – rw for owner, rx for group world
Some Others
grep pattern files – search in files for pattern
grep -r pattern dir – search for pattern recursively in dir
locate file – find all instances of file
whereis app – show possible locations of app
man command – show manual page for command
All the information in this article is gathered from the official Linux documentation and learning resources. And also we had shared a post of “Top 25 Important Linux Commands for Beginners and DevOps Enginners“. If you have any questions or want to learn more, feel free to leave a comment or contact us through the Contact us page.
FAQ section :
Frequently Asked Questions
1. Why is Linux important for DevOps Engineers?
Linux is one of the most widely used operating systems in cloud environments, servers, containers, and Kubernetes clusters. Most DevOps tools and platforms run on Linux, making Linux knowledge an essential skill for DevOps Engineers.
2. What are the most commonly used Linux commands in real projects?
Some of the most commonly used Linux commands include ls, cd, pwd, grep, find, cat, tail, chmod, ps, top, df, free, and ssh. These commands are frequently used for system administration, troubleshooting, and server management.
3. How can I learn Linux commands faster?
The best way to learn Linux commands is through hands-on practice. Create a Linux virtual machine, use the commands daily, and try small tasks such as file management, user management, process monitoring, and log analysis. Regular practice helps build confidence and improves command-line skills.
