bash script: how to run find command and variables

Question

I'm new to it. x can not be recognized from above statement. What is the problem?

x = find . -name "*.java" | wc -l
echo $x

Answer 1

It should be

x=$(find . -name "*.java" | wc -l)

(Note that there is no space around the = sign)

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To answer your question, the problem is

1. the space after x causes the shell to try to execute the command x which probably does not exist

2. you want the result of the command to be stored in x , so you need to execute the command (hence the $(...) )

Answer 2

这也应该起作用：

x=`find . -name "*.java" | wc -l`