(bash.info) Quoting
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3.1.2 Quoting
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Menu
* 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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