限制内部函数的作用域

使用带括号()定义的函数代替括号{}:

Use function defined with parenthesis () instead of braces {}:

f() (
  g() {
    echo G
  }
  g
)

# Ouputs `G`
f
# Command not found.
g

肢体功能在子shell中运行，它们具有与()和{}相同的语义，另请参见:

Parenthesis functions are run in sub-shells, which have the same semantics of () vs {}, see also: Defining bash function body using parenthesis instead of braces

如果您想使用此功能，则无法使用

This cannot be used if you want to:

• 设置变量
• exit
• cd

• set variables
• exit
• cd

那些丢失在创建的子外壳中.

as those are lost in the created sub-shell.

另请参阅: bash函数:将身体括在括号中与括号