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   bash    ( 1 )

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Определения (Definitions)

The following definitions are used throughout the rest of this
       document.
       blank  A space or tab.
       word   A sequence of characters considered as a single unit by
              the shell.  Also known as a token.
       name   A word consisting only of alphanumeric characters and
              underscores, and beginning with an alphabetic character or
              an underscore.  Also referred to as an identifier.
       metacharacter
              A character that, when unquoted, separates words.  One of
              the following:
              |  & ; ( ) < > space tab newline
       control operator
              A token that performs a control function.  It is one of
              the following symbols:
              || & && ; ;; ;& ;;& ( ) | |& <newline>