Difference between single quotes and double quotes in unix

Enclosing characters in single quotes (`'') preserves the literal value of each character within the quotes.  A single quote may not occur between single quotes, even when preceded by a backslash.

Enclosing characters in double quotes (`"') preserves the literal value of all characters within the quotes, with the exception of `$', ``', and `\'.  The characters `$' and ``' retain their special meaning within double quotes (*note 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.

The special parameters `*' and `@' have special meaning when in double quotes (*note Shell Parameter Expansion::).

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