okliv/ps

PS Gem

A gem for interacting with the process status utility on unix systems.

Getting information on a specific process

[proc1,proc2] = PS.pid(1234,321)

or for shorthand

proc1 = PS(1234)
process_list = [proc1,proc2] = PS(1234,321)

Finding process based on name

process_list = PS(/Firefox.app/)

Finding process based on attached port

To return any processes attached to port 80.

process_list = PS(':80')

Process

Processes have methods for every value listed in ps -L with % aliased to pct. The method mem was added which gives the megabytes of memory used by the process. The method kill!(sig="INT") was also added to send a kill command to the process. And you can call alive? to poll if the process is still alive.

Example

If I wanted to kill firefox if it got more than 50% cpu or 600mb of memory.

fx = PS(/Firefox.app/).first
# only kill if taking up more than 50% cpu or 600mb of memory
exit unless fx.pcpu > 50 || fx.mem > 600
retries = 0
fx.kill!
while fx.alive?
  retries += 1
  if retries > 5
    # If sigint hasn't worked after .5 sec try SIGTERM
    fx.kill!("TERM")
  end
  sleep 0.1
end