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GNU Info

Info Node: (bashref.info)Quoting

(bashref.info)Quoting

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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 (Note: 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, the
HISTORY EXPANSION character, usually `!', must be quoted to prevent
history expansion.  Note: 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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