Pure Bash Bible

Pure Bash Bible
	Dylan Araps
Table of Contents
FOREWORD
STRINGS
	Trim leading and trailing white-space from string
	Trim all white-space from string and truncate spaces
	Use regex on a string
	Split a string on a delimiter
	Change a string to lowercase
	Change a string to uppercase
	Reverse a string case
	Trim quotes from a string
	Strip all instances of pattern from string
	Strip first occurrence of pattern from string
	Strip pattern from start of string
	Strip pattern from end of string
	Percent-encode a string
	Decode a percent-encoded string
	Check if string contains a sub-string
	Check if string starts with sub-string
	Check if string ends with sub-string
ARRAYS
	Reverse an array
	Remove duplicate array elements
	Random array element
	Cycle through an array
	Toggle between two values
LOOPS
	Loop over a range of numbers
	Loop over a variable range of numbers
	Loop over an array
	Loop over an array with an index
	Loop over the contents of a file
	Loop over files and directories
FILE HANDLING
	Read a file to a string
	Read a file to an array (by line)
	Get the first N lines of a file
	Get the last N lines of a file
	Get the number of lines in a file
	Count files or directories in directory
	Create an empty file
	Extract lines between two markers
FILE PATHS
	Get the directory name of a file path
	Get the base-name of a file path
VARIABLES
	Assign and access a variable using a variable
	Name a variable based on another variable
ESCAPE SEQUENCES
	Text Colors
	Text Attributes
	Cursor Movement
	Erasing Text
PARAMETER EXPANSION
	Indirection
	Replacement
	Length
	Expansion
	Case Modification
	Default Value
BRACE EXPANSION
	Ranges
	String Lists
CONDITIONAL EXPRESSIONS
	File Conditionals
	File Comparisons
	Variable Conditionals
	Variable Comparisons
ARITHMETIC OPERATORS
	Assignment
	Arithmetic
	Bitwise
	Logical
	Miscellaneous
ARITHMETIC
	Simpler syntax to set variables
	Ternary Tests
TRAPS
	Do something on script exit
	Ignore terminal interrupt (CTRL+C, SIGINT)
	React to window resize
	Do something before every command
	Do something when a shell function or a sourced file finishes executing
PERFORMANCE
	Disable Unicode
OBSOLETE SYNTAX
	Shebang
	Command Substitution
	Function Declaration
INTERNAL VARIABLES
	Get the location to the bash binary
	Get the version of the current running bash process
	Open the user's preferred text editor
	Get the name of the current function
	Get the host-name of the system
	Get the architecture of the Operating System
	Get the name of the Operating System / Kernel
	Get the current working directory
	Get the number of seconds the script has been running
	Get a pseudorandom integer
INFORMATION ABOUT THE TERMINAL
	Get the terminal size in lines and columns (from a script)
	Get the terminal size in pixels
	Get the current cursor position
CONVERSION
	Convert a hex color to RGB
	Convert an RGB color to hex
CODE GOLF
	Shorter for loop syntax
	Shorter infinite loops
	Shorter function declaration
	Shorter if syntax
	Simpler case statement to set variable
OTHER
	Use read as an alternative to the sleep command
	Check if a program is in the user's PATH
	Get the current date using strftime
	Get the username of the current user
	Generate a UUID V4
	Progress bars
	Get the list of functions in a script
	Bypass shell aliases
	Bypass shell functions
	Run a command in the background
AFTERWORD