feat: updating script to be more robust and adding in specific username flag

scripts/kill_user_process.sh

 #!/bin/bash
 
-username="$1"
+username=""
+force=false
+
+while getopts ':u:k' uname; do
+  case $uname in
+  u)
+    username=${OPTARG}
+    ;;
+  k)
+    force=true
+    ;;
+  esac
+done
 
 usage() {
-  echo "Usage: $0 USERNAME to run graceful shutdown of processes"
-  echo "Usage: $0 USERNAME -k to run forced shutdown of processes"
+  echo "Usage: $0 -u USERNAME to run graceful shutdown of processes"
+  echo "Usage: $0 -u USERNAME -k to run forced shutdown of processes"
 }
 
 if [[ "$EUID" -ne 0 ]]; then
@@ -12,25 +24,22 @@ if [[ "$EUID" -ne 0 ]]; then
   exit 1
 fi
 
-
 if [ -z "$username" ]; then
   usage
-  exit 	1
+  exit 1
 fi
 
-userId=`id -u $1`
+userId=$(id -u $username)
 
 if [ "$username" = "root" ]; then
-	echo "Username cannot be root"
-	exit 1
+  echo "Username cannot be root"
+  exit 1
 fi
 
-if [ -z $2 ]; then
-  echo "Performing SIGTERM on processes belonging to $username"
-  pkill -u $userId
-elif [ $2 = "-k" ]; then
+if [ "$force" = true ]; then
   echo "Performing SIGKILL on processes belonging to $username"
   pkill -9 -u $userId
+else
+  echo "Performing SIGTERM on processes belonging to $username"
+  pkill -u $userId
 fi
-
-