Bash 脚本错误: “ function: not found”。为什么会出现这个错误？

我试图在我的 Ubuntu 机器上运行一个 bash script，它给了我一个错误:

未找到功能

为了进行测试，我创建了以下脚本，它可以在我的笔记本电脑上正常工作，但是在我的桌面上就不行了。知道为什么吗？如果有必要的话，我的笔记本电脑是苹果电脑。

#!/bin/bash


function sayIt {
echo "hello world"
}


sayIt

它在我的笔记本电脑上返回“ hello world”，但在我的桌面上返回:

函数未找到 hello world run.sh: 5: 语法错误: 出乎意料

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小开

Doesn't it require () after function name, or at the call? 

function sayIt() { ...
}


sayIt()

? :)

Hmm, actually, on MY mac, it works just as you pasted..

dtpwmbp:~ pwadas$ cat aa.sh
#!/bin/bash


function sayIt() {
echo "hello world"
}


sayIt


dtpwmbp:~ pwadas$ ./aa.sh
hello world
dtpwmbp:~ pwadas$

Compare bash version, AFAIR some older version required "()"s. 

dtpwmbp:~ pwadas$ bash --version
GNU bash, version 3.2.48(1)-release (x86_64-apple-darwin12)
Copyright (C) 2007 Free Software Foundation, Inc.
dtpwmbp:~ pwadas$

Also compare state of shopt options ( man bash ), on both shells, maybe one of them have some compat syntax turned on or off ? "shopt" command without args will list state of options supported.

What is the 'function' keyword used in some bash scripts?

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Chances are that on your desktop you are not actually running under bash but rather dash or some other POSIX-compliant shell that does not recognize the function keyword. The function keyword is a bashism, a bash extension. POSIX syntax does not use function and mandates the use of parenthesis.

$ more a.sh
#!/bin/sh


function sayIt {
echo "hello world"
}


sayIt
$ bash a.sh
hello world
$ dash a.sh
a.sh: 3: function: not found
hello world
a.sh: 5: Syntax error: "}" unexpected

The POSIX-syntax works in both:

$ more b.sh
#!/bin/sh


sayIt () {
echo "hello world"
}


sayIt
$ bash b.sh
hello world
$ dash b.sh
hello world
小开

I faced the same problem, I then modified the syntax and it worked for me. Try to remove the keyword function and add brackets () after the function name.

#!/bin/bash


sayIt()
{
echo "hello world"
}


sayIt
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ls -la /bin/sh

check the sym link where it point to bash or dash

小开

For me, I just edited the bash profile and forgot to restart my terminal session.


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