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--- shell [February 09, 2026 at 20:37] – yanevskiv
+++ shell [August 22, 2026 at 15:22] (current) – external edit 127.0.0.1
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+# Shell
+**Shell** is a command interpreter that lets you run programs and orchestrate them. Type commands in the terminal, chain programs via pipes, redirect input/output, and run jobs in the background. The shell parses what you type, finds the program, passes arguments, and handles environment variables.
+The most popular shell on [[gnu-linux|GNU/Linux]] is Bash. Other shells include sh (POSIX standard), zsh, and fish. All shells follow similar principles but differ in syntax and built-in features. Scripts written for POSIX sh work across shells; Bash-specific features like associative arrays do not.
+```bash
+$ echo "Hello, world"           # run a command
+$ ls -la /tmp | grep config     # pipe output to another command
+$ ./script.sh &                 # run in background
+$ VAR=value ./program           # set environment variable
+```
+The shell is also a programming language. You can write scripts (shell files) with variables, conditionals, loops, and functions to automate tasks.
+## Concepts
+. [[shell-basics|Basics]]
+. [[shell-control-flow|Control flow]]
+. [[shell-functions|Functions]]
+. [[shell-io|I/O and redirection]]
+. [[shell-advanced-features|Advanced features]]
+. [[shell-file-operations|File operations]]
+. [[shell-processes|Process management]]
+. [[shell-best-practices|Best practices]]