(bash.info) Double Quotes

 
 3.1.2.3 Double Quotes
 .....................
 
 Enclosing characters in double quotes (`"') preserves the literal value
 of all characters within the quotes, with the exception of `$', ``',
 `\', and, when history expansion is enabled, `!'.  The characters `$'
 and ``' retain their special meaning within double quotes ( Shell
 Expansions).  The backslash retains its special meaning only when
 followed by one of the following characters: `$', ``', `"', `\', or
 `newline'.  Within double quotes, backslashes that are followed by one
 of these characters are removed.  Backslashes preceding characters
 without a special meaning are left unmodified.  A double quote may be
 quoted within double quotes by preceding it with a backslash.  If
 enabled, history expansion will be performed unless an `!' appearing in
 double quotes is escaped using a backslash.  The backslash preceding
 the `!' is not removed.
 
    The special parameters `*' and `@' have special meaning when in
 double quotes ( Shell Parameter Expansion).

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(bash.info) Single Quotes

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