Learn how Bash handles input, output, and errors using file descriptors. Explore stdin, stdout, stderr, redirection operators, pipes, and practical techniques for logging command output without losing important error messages.
Learn how to use Bash’s jobs builtin to list, inspect, and manage background and stopped commands. Explore useful options and see how fg and bg help you control jobs directly from your terminal.
Learn how Bash’s kill builtin sends signals to processes, gracefully stops programs, manages jobs, and handles common signals like SIGTERM and SIGKILL — with practical examples and a few useful tricks.
Learn how to use Bash functions to organize your scripts, reuse code, handle arguments and variables, manage return statuses, and troubleshoot errors with traps. A practical guide to writing cleaner, more maintainable shell scripts.
Learn how Bash variables work, from basic assignments and default values to advanced parameter expansion. Discover how to manipulate strings, extract substrings, replace text, change letter case, and use variables more effectively in your scripts.
Learn how Bash’s for loop automates repetitive tasks, from counting through numbers to processing files, arrays, and command-line arguments. Explore both loop styles, practical examples, and common pitfalls.
Learn how Bash’s `if` statement makes decisions based on command results, comparisons, and conditions. Explore `then`, `elif`, `else`, and `fi`, with practical examples and tips for avoiding common mistakes.
Learn how Bash’s declare built-in lets you control variable attributes, create arrays, define read-only or integer variables, export values, and inspect how Bash treats your variables.
Learn how Bash’s fg built-in brings background and suspended jobs back to the foreground. Discover how to use fg, bg, and jobs, understand job numbers, and manage running commands without restarting them.
Learn how Bash’s bg built-in lets you resume stopped jobs in the background without interrupting your terminal session. Discover how to use Ctrl+Z, bg, and jobs, understand job specifications, and learn when to use bg instead of fg or &.
A concise excerpt for the `dirs` post: > Learn how Bash’s `dirs` built-in lets you inspect and manage the directory stack. Explore `-p`, `-l`, `-v`, and `-c`, select specific entries, combine options, and see how `dirs` works together with `pushd` and `popd`.
Here’s a short excerpt for the post: > Learn how Bash uses the `do` keyword to mark the beginning of a loop body. Explore how `do` works with `for`, `while`, and `until`, how it pairs with `done`, and how to write clean, readable Bash loops.