BUGA: the Bulk User and Group Adder

#!/bin/bash

# Arguments check, should only be one argument,
# and that argument needs to be a valid file in the current
# directory.

argcount=$#

if [ $argcount -ne 1 ]
then
        echo "This script requires root or sudo access, and requires one argument."
        echo "That argument must be a valid file in the current directory in the format:"
        echo -e "\ngroupname:comma,separated,list,of,members\n\nONE GROUP PER LINE."
else
        if [ -f $1 ]
        then
                # root access check
                if [ `whoami` != "root" ]
                then
                        echo -e "You should run this script as root (sudo will also work)."
                else
                        for line in `cat $1`
                        do
                                echo "==========="
                                echo -e "Processing Line:\n$line"
                                echo "==========="
                                group=`echo $line | awk -F: '{ print $1}'`
                                members=`echo $line | awk -F: '{ print $2}'`
                                if grep -q ^$group: /etc/group
                                then
                                        echo -e "\tGroup '$group' already exists."
                                else
                                        echo -e "\tCreating group '$group' ..."
                                        groupadd $group
                                fi
                                echo -e "\t\tMembers: $members"
                                for member in `echo $members | sed 's/,/ /g'`
                                do
                                        if grep -q ^$member: /etc/passwd
                                        then
                                                echo -e "\t\t\tUser '$member' already exists."
                                        else
                                                echo -e "\t\t\tCreating user '$member' ..."
                                                useradd $member
                                                # create random 8 character password
                                                password=`</dev/urandom tr -dc A-Za-z0-9 | head -c 8`
                                                echo "$member:$password" | chpasswd
                                                echo -e "\t\t\tPassword for user '$member' set to: $password"
                                        fi
                                        if `groups $member | grep -q $group`
                                        then
                                                echo -e "\t\t\tUser '$member' is already a member of '$group'."
                                        else
                                                echo -e "\t\t\tAdding user '$member' to group '$group' ..."
                                                usermod -aG $group $member
                                        fi
                                        syscheck=`id $member`; echo -e "\t\t\t$syscheck"; echo ""
                                done
                        done
                fi
        else
                echo "$1 does not exist."
        fi
fi