kill -9 + disable messages (standard output) from kill command

Question

I wrote the following script which enables timeout of 20 seconds if grep can not find the relevant string in the file.

The script works well, but the output from the script is like this:

./test: line 11: 30039: Killed

1. how to disable this message from the kill command?

2. how to tell kill command to ignore if process not exist?

THX
Yael

#!/bin/ksh  
( sleep 20 ; [[ ! -z ` ps -ef | grep "qsRw -m1" | awk '{print $2}' ` ]] && kill -9  2>/dev/null ` ps -ef | grep "qsRw -m1" | awk '{print $2}' `   ; sleep 1 ) &
RESULT=$! 
print "the proccess:"$RESULT
grep -qsRw -m1 "monitohhhhhhhr" /var
if [[ $? -ne 0 ]]
then
print "kill "$RESULT
  kill -9 $RESULT
fi
print "ENDED"


./test

the proccess:30038
./test: line 11: 30039: Killed
kill 3003

Answer 1

kill -9 $RESULT &> /dev/null

This will send stdout and stderr to /dev/null.

Answer 2

you'd better look at timeout command

man timeout

NAME
       timeout - run a command with a time limit

SYNOPSIS
       timeout [OPTION] NUMBER[SUFFIX] COMMAND [ARG]...
       timeout [OPTION]

DESCRIPTION
       Start  COMMAND,  and  kill  it if still running after NUMBER seconds.  SUFFIX may be `s' for
       seconds (the default), `m' for minutes, `h' for hours or `d' for days.

Answer 3

Messages are printed by your shell, not by the killed process.

Try runnning the proccess to be killed in an another shell, encapsulating command being killed like this:

sh -c 'command_to_be_inettrupted&'

The idea is to make the shell instance exit earlier than the process it started. You may also need to "nohup" your command, but that was unnecessary on my system.

For example:

sh -c 'sleep 10&' ; sleep 1; killall sleep

This code won't produce any output, despite first sleep instance being killed.

Answer 4

I think this message comes from job control. Try turning it off with set +m
if that doesn't work under ksh, try the script with #!/bin/bash