addusersfromcsv.sh

#!/bin/bash

###### VAR AND FUNCTION DECLATIONS ######
ARGS=$#
INPUT=$1
DELIMETER=,
OLDIFS=$IFS
i=0 #Counter
USERNAME=
PASSWORD=


checkIfFileExists()
{
    if [ ! -f "$1" ]
    then
        echo "The specified file $1 cannot be found"
        exit 0
    fi
}

checkIfUserIsRoot()
{
    if [ $EUID -ne 0 ]
    then
        echo "you have to run this script as root!"
        exit 2
    fi
}

checkIfArgsEqNull()
{
    if [ "$1" -eq 0 ]
    then
        echo "Please pass a filename!"
        exit 1
    fi
}

printSumOfCreatedUsers()
{
    echo "Created $i Users"
}

createUser()
{
    #https://unix.stackexchange.com/questions/57796/how-can-i-assign-an-initial-default-password-to-a-user-in-linux/57806#57806
    PASSWORD=$(openssl rand 1000 | strings | grep -io [[:alnum:]] | head -n 16 | tr -d '\n')
    useradd -m -p $PASSWORD $USERNAME
    storePasswordToTextFile $USERNAME $PASSWORD
}

storePasswordToTextFile()
{
    echo "$1:$2" >> user_pass.txt
}

createUserName()
{
    NNAME=$1
    VNAME=$2
    USERNAME=${NNAME:0:4}${VNAME:0:4}
}

readCSV()
{
    IFS=$DELIMETER
    while read lname vname klasse geschlecht
    do
    if (( i > 0 ))
    then
        createUserName $lname $vname
        createUser $USERNAME

    fi
    i=$(expr $i + 1)
    done < "$INPUT"
    IFS=$OLDIFS
}

###### VAR AND FUNCTION DECLATIONS END ######

checkIfUserIsRoot
checkIfArgsEqNull $ARGS
checkIfFileExists $INPUT
readCSV
printSumOfCreatedUsers