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builtin
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===
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执行shell内部命令
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## 补充说明
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**builtin命令** 用于执行指定的shell内部命令，并返回内部命令的返回值。builtin命令在使用时，将不能够再使用Linux中的外部命令。当系统中定义了与shell内部命令相同的函数时，使用builtin显式地执行shell内部命令，从而忽略定义的shell函数。
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### 语法
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```
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builtin(参数)
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```
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### 参数
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shell内部命令：指定需要执行的shell内部命令。
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### 实例
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使用builtin命令执行shell内部命alias显示命令别名，输入如下命令：
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```
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builtin alias #执行shell内部指令
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alias cp='cp -i'
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alias l.='ls -d .* --color=tty'
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alias ll='ls -l --color=tty'
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alias ls='ls --color=tty'
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alias mv='mv -i'
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alias rm='rm -i'
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alias which='alias | /usr/bin/which --tty-only --read-alias --show-dot --show-tilde'
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```
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上面的命令执行后，将输出当前系统下的命令别名。
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