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− | 3.1.1 Shell Operation
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− | The following is a brief description of the shell’s operation when it reads and executes a command. Basically, the shell does the following:
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− | 以下是当shell读取或执行一个命令时所进行操作的的一个简要描述,shell将做以下事情:
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− | # Reads its input from a file (see [[#Shell Scripts|Shell Scripts]]), from a string supplied as an argument to the -c invocation option (see [[#Invoking Bash|Invoking Bash]]), or from the user’s terminal.
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− | #: 从文件读取它的输入(参看[[#Shell Scripts|Shell Scripts]]),从字符串参数以-c调用选项方式(参看[[#Invoking Bash|Invoking Bash]]),或者从用户终端。
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− | # Breaks the input into words and operators, obeying the quoting rules described in [[#Quoting|Quoting]]. These tokens are separated by metacharacters. Alias expansion is performed by this step (see [[#Aliases|Aliases]]).
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− | #: 断句,把相关的输入分解成words和操作符,它遵循[[#Quoting|Quoting]]中的引用规则。这些tokens会被元字符分开。别名扩展将按照[[#Aliases|Aliases]]步骤被执行。
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− | # Parses the tokens into simple and compound commands (see [[#Shell Commands|Shell Commands]]).
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− | #: 这些tokens将被解析为一些简单和复合的命令(参看[[#Shell Commands|Shell Commands]])。
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− | # Performs the various shell expansions (see [[#Shell Expansions|Shell Expansions]]), breaking the expanded tokens into lists of filenames (see [[#Filename Expansion|Filename Expansion]]) and commands and arguments.
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− | #: 执行不同的shell扩展(参看[[#Shell Expansions|Shell Expansions]]),断句这些扩展的tokens为文件列表(参看[[#Filename Expansion|Filename Expansion]])命令及参数。
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− | # Performs any necessary redirections (see [[#Redirections|Redirections]]) and removes the redirection operators and their operands from the argument list.
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− | #: 执行任何必要的重定向(参看[[#Redirections|Redirections]])并且从参数列表中移除那些重定向操作符和它们的操作数。
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− | # Executes the command (see [[#Executing Commands|Executing Commands]]).
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− | #: 执行命令(参看[[#Executing Commands|Executing Commands]])。
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− | # Optionally waits for the command to complete and collects its exit status (see [[#Exit Status|Exit Status]]).
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− | #: 可选的,等待命令的完成并收集器退出状态(参看[[#Exit Status|Exit Status]])。
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