My Ultimate Linux/Ubuntu Commands Cheat Sheet (2025)

My Ultimate Linux/Ubuntu Commands Cheat (2025)

Whether you’re a beginner or an experienced sysadmin, using the Linux command line efficiently is a core skill. This comprehensive Linux/Ubuntu cheat sheet is designed to help you find the right command faster, grouped by category for everyday usage – from file management to networking, services, scripting, and more.

Bookmark it, print it, or save it – and make your terminal life easier.

File and Directory Management

Navigating the filesystem and organizing files is one of the most frequent tasks in Linux. These commands will help you move around, create, delete, and search files and directories with ease.

Command	Description
ls	List files and directories.
ls -l	Long listing format.
ls -a	Include hidden files.
cd /path	Change directory.
cd ..	Move up one level.
pwd	Print current working directory.
mkdir name	Create a new directory.
mkdir -p /a/b/c	Create nested directories.
rm file	Remove a file.
rm -r folder	Remove a directory and its contents.
cp source dest	Copy file.
cp -r dir1 dir2	Copy directories recursively.
mv source dest	Move or rename file/directory.
touch file	Create empty file or update timestamp.
find . -name "*.log"	Find files by name.
tree	Display directory tree (requires install).
du -sh *	Show folder sizes in human-readable format.
df -h	Disk space usage in human-readable format.

Related tutorials you may find useful:

• Find and Execute Commands on Found Files
• Move, Remove, and Copy Files and Directories (mv, rm, cp)
• Create and View Files (touch, cat, less, find)
• Navigation and Directory Management (cd, pwd, mkdir)

Permissions and Ownership

Controlling who can read, write, or execute a file is critical in multi-user systems. These commands help manage file and directory access rights.

Command	Description
chmod 755 file	Set file permissions.
chmod -R 755 dir	Set permissions recursively.
chown user file	Change file ownership.
chown user:group f	Change user and group ownership.
stat file	View file permission details.
umask	Show default permissions for new files.

Related tutorials you may find useful:

• Linux Permissions and Ownership – Full Command List

Package Management (APT)

Keeping your system up-to-date or installing new tools? These are the go-to commands for managing software packages on Ubuntu-based systems.

Command	Description
sudo apt update	Update package list.
sudo apt upgrade	Upgrade all packages.
sudo apt install pkg	Install package.
sudo apt remove pkg	Remove package.
sudo apt autoremove	Remove unused dependencies.
dpkg -i file.deb	Install a .deb package manually.
apt-mark showmanual	List manually installed packages.
snap list	List Snap packages.
snap install <package>	Install Snap package.

Related tutorials you may find useful:

• How to Remove Applications Using apt-get from an Ubuntu Server
• How to Remove Applications from an Ubuntu Server Using dpkg
• Remove Applications from Ubuntu Server Using Snap
• How to Remove an Application from an Ubuntu Server Manually

User and Group Management

Every Linux system involves managing users and permissions. Here’s how to add, modify, and remove users and groups.

Command	Description
adduser user	Add a new user.
passwd user	Set/change user password.
usermod -aG group user	Add user to group.
groups user	Show user’s groups.
id user	Display UID, GID, groups.
deluser user	Delete user.
groupadd group	Add a new group.

System Monitoring and Performance

Need to check memory usage or find what’s eating up CPU? These commands provide real-time system performance metrics.

Command	Description
top	Live system monitor.
htop	Enhanced interactive monitor (install separately).
ps aux	View all running processes.
free -h	Show memory usage.
uptime	Show system uptime and load average.
vmstat	Report system performance.
iostat	Report CPU/disk stats. Requires sysstat package.
watch <cmd>	Repeat a command every 2 seconds.

Monitoring your system’s performance is key to ensuring stability and identifying issues before they impact uptime. Tools like htop, atop, nload, and iostat offer real-time insights into resource usage, helping administrators quickly detect and resolve problems.

Recommended reading:

• Real-Time Performance Metrics with htop, atop, nload and iostat

Networking

From checking IP addresses to DNS lookups, these commands help you understand and troubleshoot your system’s network configuration.

Command	Description
ip a	Show IP addresses.
ip r	Show routing table.
ping host	Send ICMP packets to host.
traceroute host	Show route to host.
netstat -tulnp	Show listening ports (deprecated in favor of ss).
ss -tuln	Show active listening sockets.
curl url	Fetch web content.
wget url	Download file from web.
dig domain	DNS lookup.
nslookup domain	DNS query (older tool).

Linux provides robust tools for configuring, monitoring, and troubleshooting network interfaces and services. Understanding how to manage interfaces, analyze active ports, and work with modern tools like Netplan is essential for any system administrator.

Recommended reading:

• Linux Networking: Display Listening Ports and Listening Services
• Linux Networking: ifconfig – Managing Network Interfaces on Ubuntu
• Linux Networking: Netplan DHCP Configuration

Process Management

Sometimes you need to check, stop, or prioritize running processes. These commands let you manage what’s running on your system.

Command	Description
ps aux	List all running processes.
kill PID	Kill process by PID.
killall name	Kill all processes with the given name.
nice -n 10 cmd	Run command with adjusted priority.
renice PID	Change priority of running process.
jobs	List background jobs.
bg, fg	Resume jobs in background/foreground.

Recommended reading:

• Linux Process: List All Running Services with ps Command
• Ubuntu Process Management: Kill Command
• How to Kill All Processes Using wget on Linux

Disk and Filesystem

Keep your storage under control with these commands for managing partitions, mounting, and checking space usage.

Command	Description
lsblk	List block devices.
mount /dev/sdX /mnt	Mount device.
umount /mnt	Unmount device.
blkid	Display block device attributes.
fdisk -l	List partitions.
mkfs.ext4 /dev/sdX	Format partition as ext4.
tune2fs	Modify ext2/ext3/ext4 filesystem parameters.

Recommended reading:

• Solutions: Add New HDD to Ubuntu

Service Management (systemd)

Services (daemons) are core components in Linux. Use these commands to control background services on systemd-based systems.

Command	Description
systemctl start service	Start a service.
systemctl stop service	Stop a service.
systemctl restart service	Restart a service.
systemctl status service	Show service status.
systemctl enable service	Enable service at boot.
systemctl disable service	Disable service from autostart.
journalctl -xe	Show detailed logs.

Logs and Troubleshooting

Logs are your best friends when diagnosing system issues. These commands will help you inspect logs and track down errors.

Command	Description
journalctl -xe	Show system logs with extra detail.
dmesg	Kernel ring buffer (boot and device logs).
tail -f /var/log/syslog	Live log tailing.
less /var/log/auth.log	View login-related logs.
grep "error" logfile	Search for errors in a log file.

Scheduled Tasks

Automating tasks is easy in Linux. Use cron and systemd timers to schedule scripts or commands.

Command	Description
crontab -e	Edit current user’s crontab.
crontab -l	List cron jobs.
at 10:00	Run a one-time command at a specified time.
systemctl list-timers	Show systemd timers.

SSH and Remote Access

Securely access and manage remote systems using SSH. These commands cover key generation, file transfer, and connections.

Command	Description
ssh user@host	Connect to remote system.
scp file user@host:/path	Copy file over SSH.
rsync -avz src/ user@host:/path	Sync files over SSH.
ssh-keygen	Generate SSH key pair.
ssh-copy-id user@host	Copy SSH key to remote host.

Recommended reading:

• Passwordless SSH Login Ubuntu

Compression and Archiving

Need to archive or compress files? These are essential tools for working with .tar, .zip, and other compressed formats.

Command	Description
tar -czf archive.tar.gz dir	Create a compressed archive.
tar -xzf archive.tar.gz	Extract a .tar.gz archive.
zip -r archive.zip dir	Create a .zip archive.
unzip archive.zip	Extract .zip file.
gzip file	Compress a file.
gunzip file.gz	Decompress a file.

Text Processing and Search

Linux shines in text manipulation. With these commands, you can filter, search, and reformat text from files or input.

Command	Description
cat file	Display file contents.
less file	View large files with navigation.
head -n 10 file	Show first 10 lines.
tail -n 10 file	Show last 10 lines.
grep "word" file	Search for word in file.
cut -d':' -f1 /etc/passwd	Extract fields using delimiter.
awk '{print $1}'	Print column with awk.
sed 's/foo/bar/g'	Replace text using sed.

Recommended reading:

• File Operation: grep Text Search

Scripting and Automation

Automate repetitive tasks using shell scripts. These basic scripting examples will help you get started.

Syntax/Command	Description
#!/bin/bash	Define script interpreter.
for i in {1..5}; do ...; done	Simple loop.
if [ -f file ]; then ...; fi	File existence check.
chmod +x script.sh	Make script executable.
./script.sh	Run the script.

System Information

Quickly gather system specs, user sessions, and OS version using these handy commands.

Command	Description
uname -a	Kernel version and architecture.
lsb_release -a	Ubuntu version info.
hostnamectl	Show hostname and OS details.
who	List logged in users.
last	Show login history.

Conclusion

This Linux/Ubuntu cheat sheet includes the most useful and commonly used commands to manage your system efficiently. Whether you’re maintaining servers, developing applications, or just learning Linux, having quick access to the right commands can save you time and effort.

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Want more advanced tips? Stay tuned for upcoming articles on Bash scripting, security hardening, and automation.