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3.1.1 Shell Operation
[[文件:14.png]]
 
The following is a brief description of the shell’s operation when it reads and executes a command. Basically, the shell does the following:
 
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:
 
# 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.
#: 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。
# 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]]).  
#: 断句,把相关的输入分解成words和操作符,
# Parses the tokens into simple and compound commands (see [[#Shell Commands|Shell Commands]]).
# Performs the various shell expansions (see Shell Expansions), breaking the expanded tokens into lists of filenames (see Filename Expansion) and commands and arguments.
# Performs any necessary redirections (see Redirections) and removes the redirection operators and their operands from the argument list.
# Executes the command (see Executing Commands).
# Optionally waits for the command to complete and collects its exit status (see Exit Status).

2023年10月22日 (日) 12:07的最新版本