Bash - Everything I know

Bash
It's very useful to use ShellCheck to check any shell code you write.
Notes
The proper she-bang for Bash is #!/usr/bin/env bash.
Code
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# Check if command is in PATH
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checkDep() {
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     path=`command -v ${1}` && echo "${1} found at ${path}" || { echo "${1} not found" >&2 ; exit 1; }
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}
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# Get output of command. https://www.cyberciti.biz/faq/unix-linux-bsd-appleosx-bash-assign-variable-command-output/
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# i.e. save output of date to var now
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now=$(date)
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File testing
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​
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![](https://i.imgur.com/QGkHbPm.png)
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# Pipe output to file.
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# i.e. pipe output of ls to output.txt
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ls > output.txt
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# Check if no arguments passed
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if [ $# -eq 0 ] then ... fi
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# Check if file does not exist
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# Putting ! before makes it a not statement. Spaces before and after [] are important.
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if [ ! -f ~/Desktop/file.txt ]; then
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    echo "File not found!"
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fi
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# Source vs ./
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# Runs the script as an executable file, launching a new shell to run it
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./script
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​
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# Reads and executes commands from filename in the current shell environment
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source script
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# need to wrap the cd command inside () to run it in scope of the cd
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# i.e. pod install will be run inside ios dir
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(cd ios && pod install)
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Links
​Parameter expansion​
​Defensive BASH Programming​
​Safe ways to do things in Bash (HN)
​Pure Bash Bible - Collection of pure bash alternatives to external processes. (HN)
​Bash Infinity - Modern boilerplate / framework / standard library for Bash.
​Funky - Takes shell functions to the next level by making them easier to define, more flexible, and more interactive.
​create-bash-script - Bash script designed to create other bash scripts with argument parsing.
​Bash-LSP - Language server for Bash. (HN)
​Bash Reference Manual​
​Bash Guide​
​How To Automate Basic Development Tasks with Bash​
​Mini Gitbook for a presentation about BASH (Code)
​Bash $* and [email protected] (2017) (HN)
​Understanding Bash: Elements of Programming (2018) (HN)
​Bash tricks - Simple bash tricks which will make your life easier. (Reddit)
​Anybody can write good bash (with a little effort) (2020) (Lobsters)
​Bash Quick References​
​critic.sh - Dead simple testing framework for Bash with coverage.
​Bash Hackers Wiki (HN)
​Bats - Bash Automated Testing System.
​HN: Renaming files with mv without typing the name two times​
​The first two statements of your BASH script should be.. (2020) (Lobsters)
​Use Bash Strict Mode (Unless You Love Debugging)​
​Bash code​
​Some Relatively Obscure Bash Tips (2020) (HN)
​A Bash Cheat Sheet: Top 25 most-used commands, and how to create custom commands (2020)​
​Bash Env Variable Defaults​
​Using Bash traps in your scripts (2020)​
​Help message for shell scripts (2020) (HN) (Lobsters)
​Supercharge Your Bash History (2020) (Lobsters)
​Import - Simple and Fast Module System for Bash and Other Unix Shells. (HN)
​Intelligent Bash (ibash)​
​Functional programming in bash (Slides)
​Bash Pitfalls (Lobsters)
​argbash - Bash argument parsing code generator. (HN)
​Bash Bracket Cheat Sheet​
​Bash Error Handling (HN)
​ctypes.sh - Foreign function interface for bash. (HN)
​DevHints Bash Cheat Sheet​
​sbang - Run scripts with very long shebang lines. (Lobsters)
​Oh My Bash - Open source, community-driven framework for managing your bash configuration.
​An Awful Edge Case in Bash's set -e (2020)​
​Variant - Turn your bash scripts into a modern, single-executable CLI app.
​Even faster bash startup (2020)​
​How To Use Bash Parameter Substitution Like A Pro (2020)​
​Introduction to Bash Scripting Book​
​Bash Snippets - Collection of small bash scripts for heavy terminal users with no dependencies.
​Minimal safe Bash script template (2020) (Lobsters) (HN)
​Bash 5.1 (HN)
​Batsh - Language that compiles to Bash and Windows Batch. (Code)
​Bash HTTP monitoring dashboard​
​Parallel bash - Parallel processing of commands in pure bash along with the support of functions.
​Learn Bash in 27 minutes​
​Better BASHing Through Technology (2020)​
​bashful - Use a yaml file to stitch together commands and bash snippets and run them with a bit of style.
​bash_unit - Bash unit testing.
​Elegant bash conditionals (2021) (Lobsters)
​Bash lambda - Anonymous functions and FP stuff for bash.
​How to navigate directories faster with bash (2015) (HN)
​Your ~/.bashrc doesn't have to be a mess (2021) (Lobsters)
​Bash Function Names Can Be Almost Anything (2021) (HN)
​Writing a Bash Builtin in C to Parse INI Configs (2021) (Lobsters)
​Bashly - Create beautiful bash scripts from simple YAML configuration. (HN) (Docs)
​tree-sitter-bash - Bash grammar for tree-sitter.
​Bash Boilerplate - Collection of Bash scripts for creating safe and useful command line programs.
​Bash-TPL - Smart, lightweight shell script templating engine, written in Bash.
​Bash functions are better than I thought (2021) (Reddit) (HN)
​bash-completion - Programmable completion functions for bash.
​Bash patterns I use weekly (HN)
​How to write idempotent Bash scripts (2019) (HN)
​Mastering Bash and Terminal (2017) (HN)
​bish - Language that compiles to Bash. Shell scripting with a modern feel.
​Sherver - Pure Bash lightweight web server. (HN)
ReasonML libraries
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