沙盒:修订间差异
来自Ubuntu中文
跳到导航跳到搜索
小无编辑摘要 |
小无编辑摘要 |
||
第12行: | 第12行: | ||
#: 这些tokens将被解析为一些简单和复合的命令(参看[[#Shell Commands|Shell Commands]])。 | #: 这些tokens将被解析为一些简单和复合的命令(参看[[#Shell Commands|Shell Commands]])。 | ||
# 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. | # 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. | ||
#: | #: 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。 | ||
# Performs any necessary redirections (see [[#Redirections|Redirections]]) and removes the redirection operators and their operands from the argument list. | # Performs any necessary redirections (see [[#Redirections|Redirections]]) and removes the redirection operators and their operands from the argument list. | ||
# Executes the command (see [[#Executing Commands|Executing Commands]]). | # Executes the command (see [[#Executing Commands|Executing Commands]]). | ||
# Optionally waits for the command to complete and collects its exit status (see [[#Exit Status|Exit Status]]). | # Optionally waits for the command to complete and collects its exit status (see [[#Exit Status|Exit Status]]). |
2016年7月1日 (五) 11:49的版本
3.1.1 Shell Operation
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), from a string supplied as an argument to the -c invocation option (see Invoking Bash), or from the user’s terminal.
- 从文件读取它的输入(参看Shell Scripts),从字符串参数以-c调用选项方式(参看Invoking Bash),或者从用户终端。
- Breaks the input into words and operators, obeying the quoting rules described in Quoting. These tokens are separated by metacharacters. Alias expansion is performed by this step (see Aliases).
- Parses the tokens into simple and compound commands (see Shell Commands).
- 这些tokens将被解析为一些简单和复合的命令(参看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.
- 执行不同的shell扩展(参看Shell Expansions),断句这些扩展的tokens为文件列表(参看Filename Expansion)命令及参数。
- 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).