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Definitions

These definitions are used throughout the remainder of this manual.

POSIX
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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
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A space or tab character.

builtin
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A command that is implemented internally by the shell itself, rather than by an executable program somewhere in the file system.

control operator
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A token that performs a control function. It is a newline or one of the following: ‘||’, ‘&&’, ‘&’, ‘;’, ‘;;’, ‘;&’, ‘;;&’, ‘|’, ‘|&’, ‘(’, or ‘)’.

exit status
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The value returned by a command to its caller. The value is restricted to eight bits, so the maximum value is 255.

field
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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
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A string of characters used to identify a file.

job
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A set of processes comprising a pipeline, and any processes descended from it, that are all in the same process group.

job control
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A mechanism by which users can selectively stop (suspend) and restart (resume) execution of processes.

metacharacter
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A character that, when unquoted, separates words. A metacharacter is a space, tab, newline, or one of the following characters: ‘|’, ‘&’, ‘;’, ‘(’, ‘)’, ‘<’, or ‘>’.

name
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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
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A control operator or a redirection operator. See Redirections, for a list of redirection operators. Operators contain at least one unquoted metacharacter.

process group
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A collection of related processes each having the same process group ID.

process group ID
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A unique identifier that represents a process group during its lifetime.

reserved word
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A word that has a special meaning to the shell. Most reserved words introduce shell flow control constructs, such as for and while.

return status
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A synonym for exit status.

signal
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A mechanism by which a process may be notified by the kernel of an event occurring in the system.

special builtin
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A shell builtin command that has been classified as special by the POSIX standard.

token
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A sequence of characters considered a single unit by the shell. It is either a word or an operator.

word

A sequence of characters treated as a unit by the shell. Words may not include unquoted metacharacters.

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- Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
Licensed under the GNU Free Documentation License.
- https://www.gnu.org/software/bash/manual/html_node/Definitions.html -

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