How to write a command to a file?

Question

bash

There is such a command:
ps -U user | grep program | grep -v grep | awk '{print $1}'
If executed, it will return the PID of program.
How can I write this PID to a file without outputting an extra line? Just numbers without a newline
If you just add >, it will come out like this:

But I don't want the second line to appear

Answer 1

ps -U user | grep program | grep -v grep | awk '{print $1}' | grep -v '^$' > pid.out

Answer 2

> ps -U user | grep program | grep -v grep | awk '{print $1}'

Terrible. You definitely procps-ngdon’t have it installed there, otherwise:
$ pgrep -U user program > program.pid