怎么取消自定义shell函数?

u634781

1. tester@debian:/$ tester
   
2. tester: command not found
   
3. tester@debian:/$ function tester { echo 'hello'; }
   
4. tester@debian:/$ tester
   
5. hello
   
6. tester@debian:/$

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测试代码如上，不知道怎么可以取消tester函数呢？就是当我输入tester时重回显示tester: command not found

where27

unset tester

lkk2003rty

1. [oracle@s12071 ~]$ tester
   
2. -bash: tester: command not found
   
3. [oracle@s12071 ~]$ function tester { echo 'hello'; }
   
4. [oracle@s12071 ~]$ tester
   
5. hello
   
6. [oracle@s12071 ~]$ unset tester
   
7. [oracle@s12071 ~]$ tester
   
8. -bash: tester: command not found
   
9. [oracle@s12071 ~]$

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u634781

谢谢