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I am used to using this command line to kill any process match said COMMAND

for i in $(ps -ef | grep COMMAND | awk '{ print $2 }'); do kill -9 "$i" &>/dev/null;done
shellcheck does not like it much and suggests 
root@singa /home # shellcheck run
In run line 4:
for i in $(ps -ef | grep COMMAND | awk '{ print $2 }'); do kill -9 "$i" &>/dev/null;done
           ^-- SC2009: Consider using pgrep instead of grepping ps output.
what are the flags needed to complete this here replacing the XXX
for i in $(pgrep XXX | grep COMMAND | awk '{ print $2 }'); do kill -9 "$i" &>/dev/null;done
I have already checked the man page for pgrep.
                Did you even try just running pgrep COMMAND before trying to drop it in the place of ps in your script?  That should make it clear what has hone wrong with what you did.
– DopeGhoti
                Jun 14, 2018 at 21:51
i have done below method
for i in pickup hald-runner; do pgrep $i | awk '{print "kill" " "  $1}'| sh;done
Here pickup,hald-runner is the process names