bash 如何将grep输出重定向到变量?
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时间:2020-09-18 11:18:49 来源:igfitidea点击:
How to redirect grep output to a variable?
提问by Denis
I have some pipe. For example, I have this pipe:
我有一些管子。例如,我有这个管道:
user@user:~$ cal | head -1 | grep -oP "[A-Za-z]+"
For this pipe I get this result:
对于这个管道,我得到了这个结果:
September
I want to store this result to a variable. I write the following commands:
我想将此结果存储到变量中。我写了以下命令:
user@user:~$ cal | head -1 | month=$(grep -oP "[A-Za-z]+") | echo $month
And I get the blank string. What is the problem?
我得到了空白字符串。问题是什么?
回答by Cyrus
month=$(cal | head -1 | grep -oP "[A-Za-z]+")
or
或者
month=$(date +%B)