centos - ps -C nginx --no-header | wc -l，这个命令不太懂

Question

ps 后面除了 nginx ，其他的参数不太理解呀

Answer 1

| The pipe character passes the results from the previous PS to the later processing in strips
wc -l to check how many strips there are

Answer 2

I feel like I wrote it wrong:
-c simple name of the executable
-C complete command line
--no-headers does not print the beginning (or header file)

wc -l counts the number of lines