Getting started

Craps Quick Reference
Blackjack Quick Reference
Blackjack Quick Reference Card
Blackjack Quick Reference Card

Introduction

★ This is the first app to be developed by Aeon Apps, and was originally intended as a quick, lightweight, on-the-go tool to help learn basic strategy of blackjack at the casino. Benefits of a Blackjack Strategy Card The strategy cards help new players learn basic strategy. There are a lot of moves to make and the cards display it in a simple fashion. Also, all the correct blackjack moves are printed right there so you have a quick guide to reference by in case you don't remember something.

This is a quick reference to getting started with Bash scripting.

Learn bash in y minutes(learnxinyminutes.com)
Bash Guide(mywiki.wooledge.org)

Example

Variables

String quotes

Shell execution

See Command substitution

Conditional execution

Functions

See: Functions

Conditionals

See: Conditionals

Strict mode

See: Unofficial bash strict mode

Brace expansion

Expression	Description
`{A,B}`	Same as `A B`
`{A,B}.js`	Same as `A.js B.js`
`{1.5}`	Same as `1 2 3 4 5`

See: Brace expansion

Parameter expansions

Basics

Coconut creek casino telephone number search. See: Parameter expansion

Substitution

Code	Description
`${FOO%suffix}`	Remove suffix
`${FOO#prefix}`	Remove prefix
`${FOO%%suffix}`	Remove long suffix
`${FOO##prefix}`	Remove long prefix
`${FOO/from/to}`	Replace first match
`${FOO//from/to}`	Replace all
`${FOO/%from/to}`	Replace suffix
`${FOO/#from/to}`	Replace prefix

Substrings

Expression	Description
`${FOO:0:3}`	Substring (position, length)
`${FOO:(-3):3}`	Substring from the right

Length

Expression	Description
`${#FOO}`	Length of `$FOO`

Manipulation

Default values

Expression	Description
`${FOO:-val}`	`$FOO`, or `val` if unset (or null)
`${FOO:=val}`	Set `$FOO` to `val` if unset (or null)
`${FOO:+val}`	`val` if `$FOO` is set (and not null)
`${FOO:?message}`	Show error message and exit if `$FOO` is unset (or null)

Omitting the : removes the (non)nullity checks, e.g. ${FOO-val} expands to val if unset otherwise $FOO.

Loops

Basic for loop

C-like for loop

Ranges

With step size

Reading lines

Forever

Functions

Defining functions

Returning values

Raising errors

Arguments

Expression	Description
`$#`	Number of arguments
`$*`	All arguments
`$@`	All arguments, starting from first
`$1`	First argument
`$_`	Last argument of the previous command

See Special parameters.

Conditionals

Conditions

Note that [[ is actually a command/program that returns either 0 (true) or 1 (false). Any program that obeys the same logic (like all base utils, such as grep(1) or ping(1)) can be used as condition, see examples.

Condition	Description
`[[ -z STRING ]]`	Empty string
`[[ -n STRING ]]`	Not empty string
`[[ STRING STRING ]]`	Equal
`[[ STRING != STRING ]]`	Not Equal
`[[ NUM -eq NUM ]]`	Equal
`[[ NUM -ne NUM ]]`	Not equal
`[[ NUM -lt NUM ]]`	Less than
`[[ NUM -le NUM ]]`	Less than or equal
`[[ NUM -gt NUM ]]`	Greater than
`[[ NUM -ge NUM ]]`	Greater than or equal
`[[ STRING =~ STRING ]]`	Regexp
`(( NUM < NUM ))`	Numeric conditions

More conditions

Condition	Description
`[[ -o noclobber ]]`	If OPTIONNAME is enabled
`[[ ! EXPR ]]`	Not
`[[ X && Y ]]`	And
`[[ X \|\| Y ]]`	Or

File conditions

Condition	Description
`[[ -e FILE ]]`	Exists
`[[ -r FILE ]]`	Readable
`[[ -h FILE ]]`	Symlink
`[[ -d FILE ]]`	Directory
`[[ -w FILE ]]`	Writable
`[[ -s FILE ]]`	Size is > 0 bytes
`[[ -f FILE ]]`	File
`[[ -x FILE ]]`	Executable
`[[ FILE1 -nt FILE2 ]]`	1 is more recent than 2
`[[ FILE1 -ot FILE2 ]]`	2 is more recent than 1
`[[ FILE1 -ef FILE2 ]]`	Same files

Example

Arrays

Defining arrays

Working with arrays

Operations

Iteration

Dictionaries

Defining

Declares sound as a Dictionary object (aka associative array).

Working with dictionaries

Iteration

Iterate over values

Iterate over keys

Options

Options

Glob options

Set GLOBIGNORE as a colon-separated list of patterns to be removed from globmatches.

History

Commands

Command	Description
`history`	Show history
`shopt -s histverify`	Don’t execute expanded result immediately

Expansions

Expression	Description
`!$`	Expand last parameter of most recent command
`!*`	Expand all parameters of most recent command
`!-n`	Expand `n`th most recent command
`!n`	Expand `n`th command in history
`!<command>`	Expand most recent invocation of command `<command>`

Operations

Code	Description

Blackjack Quick Reference