Create an account for each user listed in the external file

create_users.sh

#!/bin/sh

# Example:
# sh create_users.sh file_with_usernames.txt

if [ -z "$1"]                                   # check if filename is given
then
    echo "No input filename given, exiting."
else
    while read NAME; do
        echo "Adding user $NAME";
        useradd -m "$NAME";                     # add user with home folder
    done < $1
fi