Kick user from server (kills all SSH sessions for them)

kick

#!/bin/bash

# Make sure at least the first parameter is set
if [ -z "$1" ]; then
	echo "Usage: kick [-d] user"
	exit
fi

# Check if the -d flag (delete) is set
if [[ "$1" == '-d' ]]; then
	user=$2
	del='yes'
elif [[ "$2" == '-d' ]]; then
	user=$1
	del='yes'
else
	user=$1
	del='no'
fi

# Get the original starter of the script
starter=$(who am i | awk '{print $1}')

# Abort if the starter is trying to kick themselves
if [[ "$starter" == "$user" ]]; then
	echo "Umm... no; I'm not kicking you."
	exit
fi

# Get the list of process ids and users for each ssh process
pids=$(ps ax| grep sshd | grep "@pts/" | awk '{ print $1 }')
users=$(ps ax| grep sshd | grep "@pts/" | awk '{ print $6 }' | sed -r "s/@pts\/[0-9]?//")

# Split into arrays
pids=(${pids// /})
users=(${users// /})

# Loop through each user
for u in "${!users[@]}"
do	
	# If they're the right user, kill the ssh process
	if [[ "${users[u]}" == $user ]]; then
		echo "Kicking $user (pid ${pids[u]})"
		kill -9 "${pids[u]}"
	fi
done

# Once done, delete the user if desired
if [[ "$del" == 'yes' ]]; then
	userdel "$user"
fi