bash 如何退出bash中的函数
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How to exit a function in bash
提问by Atomiklan
How would you exit out of a function if a condition is true without killing the whole script, just return back to before you called the function.
如果条件为真，您将如何退出函数而不终止整个脚本，只需返回调用函数之前。
Example
例子
# Start script
Do scripty stuff here
Ok now lets call FUNCT
FUNCT
Here is A to come back to
function FUNCT {
if [ blah is false ]; then
exit the function and go up to A
else
keep running the function
fi
}
回答by mohit
Use:
用：
return [n]
From help return
从 help return
return: return [n]
Return from a shell function. Causes a function or sourced script to exit with the return value specified by N. If N is omitted, the return status is that of the last command executed within the function or script. Exit Status: Returns N, or failure if the shell is not executing a function or script.
返回: 返回 [n]
Return from a shell function. Causes a function or sourced script to exit with the return value specified by N. If N is omitted, the return status is that of the last command executed within the function or script. Exit Status: Returns N, or failure if the shell is not executing a function or script.
回答by Nemanja Boric
Use returnoperator:
使用return运算符：
function FUNCT {
if [ blah is false ]; then
return 1 # or return 0, or even you can omit the argument.
else
keep running the function
fi
}
回答by Elliot Cameron
If you want to return from an outerfunction with an error without exiting you can use this trick:
如果你想从一个带有错误的外部函数返回而不exit使用 ing 你可以使用这个技巧：
do-something-complex() {
# Using `return` here would only return from `fail`, not from `do-something-complex`.
# Using `exit` would close the entire shell.
# So we (ab)use a different feature. :)
fail() { : "${__fail_fast:?}"; }
nested-func() {
try-this || fail "This didn't work"
try-that || fail "That didn't work"
}
nested-func
}
Trying it out:
尝试一下：
$ do-something-complex
try-this: command not found
bash: __fail_fast: This didn't work
This has the added benefit/drawback that you can optionally turn off this feature: __fail_fast=x do-something-complex.
这具有额外的好处/缺点，您可以选择关闭此功能：__fail_fast=x do-something-complex。
Note that this causes the outermost function to return 1.
请注意，这会导致最外层函数返回 1。
