What I want is printing the output the first line ( table head ) of ps aux
and the grep result.
After search, I come up with following.
ps aux | tee >(head -1 > /dev/tty) | grep mongo
But I find the stdin of grep mongo
is cut off.
Also, if I omit > /dev/tty
, what will the stdout of head -1
direct to? Why isn't it the console?
(Yes, I know I can achive my purpose by command awk
. I am just curious about why my command doesn't work?)