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Quoting

Words may be quoted with the characters (") (double quote), (') (single quote), and (`) (back quote). A word enclosed by any of these quotes may contain white space. A string enclosed by double quotes may have further special-character substitutions done on it, but it will be considered a single token by the shell. A number so quoted is considered a string. A string enclosed by single quotes also has all its special characters protected. Thus no global expansion (*, ?, etc), variable expansion ($), or history substitution (^, !) will be done. A string enclosed by backquotes is considered a command to the shell and is executed, and the output of the command replaces the text. The backslash character performs the usual single character quoting function. In addition, Ctrl-V also provides a single character quoting function from the keyboard.



Stephen R. Whiteley 2012-09-24