Bash kill a process with a specified name

kill `ps x | awk '$5=="process_name" {printf $1}'`

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For example, to kill "epiphany-browser":
ps x
->23243 ? Sl 0:57 epiphany-browser

kill `ps x | awk '$5=="epiphany-browser" {printf $1}'`

,where
$1=23243 (pid)
$5=epiphany-browser