Question

Write a script using the bash shell to add new users to the system. The script should read user information from a comma-delimited file (each field should be separated by a comma).

The filename should be passed to the script as a command-line argument. Be sure the script contains a usage clause.

The input file should contain the user information with one user per line.

As the system administrator, you should determine the information necessary for each user to properly add their account. Be sure to include in the program documentation the format for each line (identify each field contents).

Answer 1

save below script as adduser.sh

#!/bin/bash
# checking if file was passed or not
if [ "$#" -ne 1 ]; then # comparing not equal to 1
    echo "usage: bash adduser.sh <filename>" # printing usage clause
    exit 1 # if not file exiting
fi
# getting file name
file="$1"
# reading line by comma separated value
while IFS=, read -r user pass
do
    echo "Adding user : $col1"
    # using useradd command for adding user
    useradd -m ${user} -p ${pass}
    echo ""
done <"$file" # reading file

users.csv -> make sure have new line after last record

Alisha,PASSW0R1D
Rohit, PASSW0R1D

U can run script as

sudo bash useradd.sh users.csv

# OUT

$sudo bash adduse r . sh users.csv [sudo] password for roushan: Adding user : Alisha Adding user Rohit $sudo bash adduser. sh usage: bash adduser . sh <filename>

after running script you can verify user by

cat /etc/passwd