在 bash 中，您可以使用函数调用作为 if 语句中的条件吗？
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In bash, can you use a function call as a condition in an if statement?
提问by chickeninabiscuit
here's what i'm trying to achive:
这就是我想要达到的目标：
function f1() {
return 0
}
function f2() {
return 0
}
if [[ f1 && f2 ]]; then
echo "success"
else
echo "fail"
fi
回答by Ignacio Vazquez-Abrams
You don't use [[(or [) when running a command and checking the result code.
在运行命令和检查结果代码时不要使用[[(或[)。
if f1 && f2 ; then
echo "success"
else
echo "fail"
fi
回答by evan
Yes. You can do this by checking against a return by means of echo (although not a strict return):
是的。您可以通过使用 echo 来检查返回（尽管不是严格返回）来做到这一点：
if [[ "$(f1)" == "whatever" ]]works
if [[ "$(f1)" == "whatever" ]]作品
See this page for more on function return values. It also has a couple of good comments specifically talking about if statements.
有关函数返回值的更多信息，请参阅此页面。它也有一些很好的评论，专门讨论 if 语句。
http://www.linuxjournal.com/content/return-values-bash-functions
http://www.linuxjournal.com/content/return-values-bash-functions
