How can I exit the 'loop' of 'top | grep user'?

Question

I want to use top | grep user top | grep user to know how many processes are running.

However, after I run top | grep user > temp_file top | grep user > temp_file , the command just keeps running.

How can I safely stop it with information being written to the temp_file ?

Answer 1

You can use the -n 1 option to top to make it only do one iteration.

Probably the better tool to use would be ps , as in ps aux | grep user ps aux | grep user .

Answer 2

如果计数是您感兴趣的全部：

pgrep -cu username