Here are 10 foundational Linux commands that demonstrate basic terminal competency:

1. ls — List directory contents

bash
ls -la /home/user

2. cd — Change directory

bash
cd /var/log

3. pwd — Print working directory

bash
pwd

4. cat — Display file contents

bash
cat /etc/os-release

5. grep — Search text using patterns

bash
grep -i “error” /var/log/syslog

6. chmod — Change file permissions

bash
chmod 755 script.sh

7. ps — Display running processes

bash
ps aux | grep nginx

8. sudo — Execute commands with elevated privileges

bash
sudo systemctl restart networking

9. df — Report filesystem disk space usage

bash
df -h

10. ssh — Securely connect to a remote host

bash
ssh user@192.168.1.100

Together these cover navigation (ls, cd, pwd), file inspection (cat, grep), permissions (chmod, sudo), system monitoring (ps, df), and remote access (ssh) — the core muscle memory for anyone comfortable at a Linux prompt.