Bash
Bash scripting, shell fundamentals, automation patterns, and common pitfalls.
Bash: Check if String Contains Substring
Four ways to check if a string contains a substring in Bash: wildcard matching, the case statement, the regex operator, and grep. Includes examples and a Quick Reference.
Bash set Command: set -e, set -x, and set -u Explained
How the bash set builtin changes shell behavior, with practical examples of set -e to exit on errors, set -u to catch unset variables, set -x to trace execution, and pipefail.
Bash Arithmetic: Integer and Floating-Point Math
How to do arithmetic in Bash with the (( )) operator, $(( )) expansion, the let builtin, and bc or awk for floating-point math the shell cannot do natively.
Bash String Manipulation: Substring, Replace, Length, and More
Bash string manipulation using parameter expansion: extract substrings, replace text, strip prefixes and suffixes, change case, and check for substrings with practical examples.
Bash: Write to File
Redirect output to files in Bash using the > and >> operators, tee command, and heredocs, with examples for overwriting, appending, and writing multiple lines.
Bash Split String: Split a String by Delimiter
How to split a string in Bash by a delimiter using read, IFS, tr, awk, and parameter expansion, with practical examples for scripts.
Bash break and continue Statements
The break and continue statements in Bash control loop execution. Use break to exit a loop early and continue to skip the current iteration.
Bash Strict Mode: set -euo pipefail Explained
A practical guide to Bash strict mode: how set -e, set -u, set -o pipefail, and IFS change script behavior, why they catch silent failures, and when to turn them off.
Bash Heredoc: Complete Guide with Examples
Bash heredoc lets you pass multi-line text directly to a command inside a shell script. This guide covers syntax, variable expansion, indentation with <<-, SSH usage, and common mistakes.
Bash Functions
How to define and use Bash functions, pass arguments, return values, and apply best practices for writing cleaner and more maintainable scripts.
pushd and popd Commands in Linux: Navigate Directories with a Stack
The pushd and popd commands let you save directories to a stack and jump between them instantly. This guide covers syntax, the dirs command, stack rotation, and practical workflow examples.
Bash printf Command
A practical guide to printf in Bash: formatting numbers, strings, and alignment.
Bash read Command
The Bash read command reads a line from standard input and splits it into variables. This guide covers IFS, prompts, silent input, timeouts, arrays, file reading, and practical script examples.
Bash Range: Sequence Expression Syntax and Examples
The Bash sequence expression generates a range of integers or characters using {START..END} syntax. This guide covers step increments, zero-padding, for loop usage, and how to handle variable ranges with seq.
Bash Comments: Single-Line, Multiline, and Best Practices
Learn how to comment in Bash scripts with single-line, inline, and multiline comment patterns. Includes block comment workarounds and best practices for readable shell scripts.
How to Increment and Decrement a Variable in Bash: Counter Examples
Bash provides several ways to increment and decrement a counter variable in scripts. This guide covers the +/- operators, += and -= assignment operators, and the ++ and -- shorthand with practical examples.
Bash Arrays
A complete guide to Bash arrays: create indexed and associative arrays, access elements, loop, slice, add and remove items, and check array length.
How to Compare Strings in Bash
Bash string comparison using equal, not equal, regex, and pattern matching operators. Includes examples for empty strings, case-insensitive matching, and substrings.
Bash Select (Make Menus)
Learn how to use the Bash select construct to create interactive menus in shell scripts. Includes syntax, practical examples, and combining select with case.
Bash wait Command
Learn how to use the Bash wait command to wait for background processes to finish. This guide covers syntax, options, and practical scripting examples.
