# Values

Values: Quotes: Double, Single and None, Values from Commands: $( ) and $(( )).

Updated: November 10, 2026

1. [Quotes: Double, Single and None](https://www.ask-codey.com/lessons/bash-quoting) (Journeyman): Without quotes, the shell splits a variable's value at its spaces and turns a \* into file names, the number-one bash bug; "$name" in double quotes keeps the value exactly as it is, and single quotes keep everything as typed.
2. [Values from Commands: $( ) and $(( ))](https://www.ask-codey.com/lessons/bash-command-substitution) (Apprentice): $( ) runs a command and puts what it prints into another command or a variable, such as today's date in a backup's name, and $(( )) works out whole-number arithmetic, such as an age or a count plus one.

Source: https://www.ask-codey.com/courses/bash-in-depth/topics/bash-values