bash 如果命令带有用户输入 OS X 终端
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If command with user input OS X terminal
提问by Pistachios
So I'm new to the OS X terminal and I'm trying to figure out how to use the ifcommand with the readcommand.
所以我是 OS X 终端的新手，我正在尝试弄清楚如何将if命令与命令一起使用read。
Like this:
像这样：
echo stuff:
read f
if [ "$f" == "y"]
then
echo wassup
else exit
What am I doing wrong?
我究竟做错了什么？
回答by icktoofay
You're asking bash to compare whether the strings fand yare equivalent. Clearly, they're not. You need to use a variable substitution:
您要求 bash 比较字符串f和y是否相等。显然，他们不是。您需要使用变量替换：
if [ "$f" == "y" ]
With this, it's asking “is the string consisting of the contents of the variable fequivalent to the string y?”, which is probably what you were trying to do.
有了这个，它会问“由变量的内容组成的字符串是否与字符串f等效y？”，这可能是您想要做的。
You're also missing an fi(ifbackwards), which ends the ifstatement. Together:
您还缺少一个fi(if向后)，它结束了if语句。一起：
if [ "$f" == "y" ]
then
# true branch
else
# false branch
fi
