Linux is an open-source operating system kernel widely used on servers, desktops, mobile devices, and embedded systems. Known for its stability, security, and flexibility, it forms the foundation of cloud computing and internet infrastructure.
The Shell is the command-line interface for interacting with the Linux kernel. The most common shell is Bash (Bourne Again Shell). Through the shell, users execute commands, write scripts, and automate tasks.
Server administration, software development, system operations, DevOps, cybersecurity, data analysis, and more. This cheat sheet covers the most commonly used Linux commands with real-time search filtering.
Linux is an open-source operating system kernel widely used on servers, desktops, and embedded devices. Created by Linus Torvalds in 1991, it is the most popular server OS.
chmod 755 sets file permissions: owner can read/write/execute (rwx=7), group can read/execute (r-x=5), others can read/execute (r-x=5). This is a common permission for directories and executables.
grep searches files or output for lines matching a regular expression. Commonly used for log analysis, code search, and text filtering. Supports regex, recursive search, and inverse matching.
Use free -h for a memory usage summary, or top/htop for real-time process and memory monitoring. You can also check /proc/meminfo for detailed information.
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