Sinatra print string on webpage - ruby-on-rails

Question

I am trying to print process status on webpage. But when execute host:port/status method I dont see any response. It returns a blank page. ps -ef command executes on command line. I tried printing it on getStatus Method but it doesnt print it.
I want to display process execution status on website.
def getStatus
puts #{system('ps -ef | grep abc.jar|grep -v grep')? "Running": "Stopped"}
return #{system('ps -ef | grep abc.jar|grep -v grep')? "Running": "Stopped"}
end
get '/status' do
return getStatus
end

Answer 1

The expression
puts #{…
will only print a newline character, since # outside a string introduces a comment, same with return #….
To get the actual output, use something like this (I took the freedom to transformed your code snippet into more idiomatic Ruby):
def running?
`ps -ef` =~ /abc\.jar/
end
get '/status' do
status = running? ? 'Running' : 'Stopped'
logger.debug "Status: #{status}"
status
end
Now the running? method performs your check:
get the result of ps -ef via Kernel#`
match that result against the regular expression /abc\.jar/ via String#=~ (basically perform grep abc\.jar in Ruby land)
Step 1 is performed in a sub shell and everything in the sub shell is returned into Ruby land, whereas Kernel#system will only return whether the command exited with a non-zero exit status. Any output from commands started with system('...') is also redirected to stdout Your inital code snippet would not have worked that way, since grep -v grep will always exit with status 0.
(technically, a sub shell is not required, but the IO.popen call is more complex)