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These definitions are used throughout the remainder of this manual. POSIX : A family of open system standards based on Unix. Bash is primarily concerned with the Shell and Utilities portion of the POSIX 1003.1 standard. blank : A space or tab character. builtin : A command that is implemented internally by the shell itself, rather than by an executable program somewhere in the file system. control operator : A token that performs a control function. It is a newline or one of the following: ‘||’, ‘&&’, ‘&’, ‘;’, ‘;;’, ‘|’, ‘|&’, ‘(’, or ‘)’. exit status : A unit of text that is the result of one of the shell expansions. After expansion, when executing a command, the resulting fields are used as the command name and arguments. field : A unit of text that is the result of one of the shell expansions. After expansion, when executing a command, the resulting fields are used as the command name and arguments. filename : A string of characters used to identify a file. job : A set of processes comprising a pipeline, and any processes descended from it, that are all in the same process group. job control : A mechanism by which users can selectively stop (suspend) and restart (resume) execution of processes. metacharacter : A character that, when unquoted, separates words. A metacharacter is a blank or one of the following characters: ‘|’, ‘&’, ‘;’, ‘(’, ‘)’, ‘<’, or ‘>’. name : A word consisting solely of letters, numbers, and underscores, and beginning with a letter or underscore. Names are used as shell variable and function names. Also referred to as an identifier. operator : A control operator or a redirection operator. See [[#Redirections|Redirections]], for a list of redirection operators. Operators contain at least one unquoted metacharacter.
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