沙盒
来自Ubuntu中文
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, for a list of redirection operators. Operators contain at least one unquoted metacharacter.
process group
- A collection of related processes each having the same process group ID.
process group ID
- A unique identifier that represents a process group during its lifetime.
reserved word
- 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
- A synonym for exit status.
