mjhjmtu

Need to create a bash script to create a username from a file which contains below (username home directory full name)

drs /home/drs Paranas Theruwalan

My script:

!#/bin/bash
#call data from file
file="file.txt"
USERNAME=$(cat file.txt | cut -d: -f1)

USER_FULLNAME=$(cat file.txt | cut -d: -f2)

useradd -m ($USERNAME) -c ($USER_FULNAME)

I getting invalid username error.

First you should remove the () for using variables:
useradd -m $USERNAME -c $USER_FULNAME

Second check the output of username, maybe it includes invalid characters.

Here you go:

#!/bin/bash
#call data from file
FILE="file.txt"
USERNAME=$(cut -d " " -f 1 $FILE)
USER_FULLNAME=$(cut -d " " -f 3,4 $FILE)
useradd -m -c "$USER_FULLNAME" "$USERNAME" 

What are your separators, space or colon? You example suggests space, your code suggests colon.

You can do that in bash.

#!/bin/bash
file="file.txt"
while IFS=: read USERNAME USER_HOME USER_FULLNAME; do
 useradd -m -c "$USER_FULLNAME" -d "$USER_HOME" "$USERNAME"
done < "$file"

This example assumes as input a file with lines like

drs:/home/drs:Paranas Theruwalan