(bash.info) Quoting

 
 3.1.2 Quoting
 -------------

 
* Escape Character    How to remove the special meaning from a single
 			character.
* Single Quotes       How to inhibit all interpretation of a sequence
 			of characters.
* Double Quotes       How to suppress most of the interpretation of a
 			sequence of characters.
* ANSI-C Quoting      How to expand ANSI-C sequences in quoted strings.
* Locale Translation  How to translate strings into different languages.
 
    Quoting is used to remove the special meaning of certain characters
 or words to the shell.  Quoting can be used to disable special
 treatment for special characters, to prevent reserved words from being
 recognized as such, and to prevent parameter expansion.
 
    Each of the shell metacharacters ( Definitions) has special
 meaning to the shell and must be quoted if it is to represent itself.
 When the command history expansion facilities are being used (
 History Interaction), the HISTORY EXPANSION character, usually `!',
 must be quoted to prevent history expansion.   Bash History
 Facilities, for more details concerning history expansion.
 
    There are three quoting mechanisms: the ESCAPE CHARACTER, single
 quotes, and double quotes.

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