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Korn Shell: Unix and Linux Programming Manual, Third Edition, The by Anatole Olczak

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Definitions

A metacharacter is one of the following characters:

;   &   ( )   |   <   >   new-line   space   tab 

A blank is a tab or a space. An identifier is a sequence of letters, digits, or underscores starting with a letter or underscore. Identifiers are used as components of variable names. A vname is a sequence of one or more identifiers separated by a . and optionally preceded by a .. Vnames are used as function and variable names. A word is a sequence of characters from the character set defined by the current locale, excluding non-quoted metacharacters.

A command is a sequence of characters in the syntax of the shell language. The shell reads each command and carries out the desired action either directly or by invoking separate utilities. ...

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