|
|
(未显示3个用户的65个中间版本) |
第1行: |
第1行: |
− | These definitions are used throughout the remainder of this manual.
| + | [[文件:14.png]] |
− | | + | |
− | 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.
| + | |