Quick User Creation

#!/bin/bash

# Variable assignment for legibility. The file content should be
# in the form of:
# username, password
filename=$1

# If the file exists, loop through it and start making accounts
# else just quit and display the help.
if [ -e $filename ]
then
  while read line; do
    # Parse the string and store in the userinfo array.
    IFS="," userinfo=($line)
    # Strip leading and trailing whitespace from each string
    # Also, too lazy to shorten this up.
    username=$(echo ${userinfo[0]} | sed -e 's/^ *//g;s/ *$//g')
    password=$(echo ${userinfo[1]} | sed -e 's/^ *//g;s/ *$//g')
    # Check to see if the user already exists, if it doesn't then
    # create it.
    if id -u $username >/dev/null 2>&1
    then
      echo "User '$username' already, exists!"
    else
      echo -n "Creating user '$username'..."
      useradd -m $username
      echo "done."
    fi
    # Change the password for the user
    echo "$username:$password" | chpasswd
  done < $filename
else
  echo "Usage: $0 <filename>"
fi