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enable
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===
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启动或关闭shell内建命令
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## 补充说明
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**enable命令** 用于临时关闭或者激活指定的shell内部命令。若要执行的文件名称与shell内建命令相同，可用`enable -n`来关闭shell内建命令。若不加`-n`选项，enable可重新启动关闭的命令。
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linux shell命令执行时，shell总是先在自己的shell builtin中查找该命令，如果找到则执行该命令；如果找不到该命令，则会从环境变量$PATH指定的路径中依次去查找待执行的命令。因为了解了这一点，所以看起来好像没有办法编写用户自己的命令来替代shell builtin命令。幸运的是，有了enable命令我们就能做到了。
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### 语法
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```
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enable(选项)(参数)
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```
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### 选项
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```
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-n：关闭指定的内部命令；
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-a：显示所有激活的内部命令；
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-f：从指定文件中读取内部命令。
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```
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### 参数
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内部命令：指定要关闭或激活的内部命令。
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### 实例
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使用enable命令显示所有激活的内部命令：
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```
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[root@localhost ~]# enable -a
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enable .
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enable :
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enable alias
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enable bg
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enable bind
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enable break
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enable builtin
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enable caller
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enable cd
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enable command
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enable compgen
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enable complete
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enable continue
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enable declare
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enable dirs
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enable disown
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enable echo
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enable enable
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enable eval
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enable exec
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enable exit
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enable export
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enable false
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enable fc
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enable fg
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enable getopts
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enable hash
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enable help
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enable history
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enable jobs
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enable kill
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enable let
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enable local
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enable logout
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enable popd
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enable printf
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enable pushd
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enable pwd
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enable read
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enable readonly
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enable return
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enable set
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enable shift
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enable shopt
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enable source
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enable suspend
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enable test
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enable times
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enable trap
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enable true
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enable type
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enable typeset
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enable ulimit
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enable umask
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enable unalias
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enable unset
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enable wait
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```
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<!-- Linux命令行搜索引擎：https://jaywcjlove.github.io/linux-command/ -->
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