mjhjmtu

I am having hard time adding a user to a group in script. For example, I have a script that asks user to answer several questions, and if answers are correct, that user should be added to a certain group. So I probably need a way to somehow identify which user is answering questions (there are multiple users) and then based on his answers adding him/her to a group. Can anyone help?

I also created a simple script.

Below script is creating a new user on the system.

I'm very glad if you can use it as a reference.

Set the group name to VALIDGROUPS variable beforehand and

select it at the time of execution.

 1 #!/bin/bash
 2
 3 VALIDGROUPS="GROUP1, GROUP2, GROUP3"
 4
 5 printf "Add your account on this systemnn"
 6 printf "Enter your name here, No space allowed for your user name : "
 7 read USERNAME
 8
 9 printf "Valid user groups are $VALIDGROUPS Choose select one: "
10 read USERGROUP
11
12 grep $USERGROUP /etc/group 2>&1>/dev/null
13 if [ $? != 0 ]
14 then
15 printf "Group Name you entered $USERGROUP is not validn"
16 printf "Creating Abort!n"
17 exit 1
18 else
19 useradd -g $USERGROUP -d /home/$USERNAME -s /bin/bash -m $USERNAME
20 passwd $USERNAME
21 fi
22
23 id $USERNAME
24
25 printf "done!n"
26
27 exit 0

You can add a line in your script to find out who is executing the script using

user=$(whoami)
echo $user

If the script needs to be run with sudo, whoami will always give root as user , so you need to use $SUDO_USER variable

user=$SUDO_USER
echo $user

If the user uses, su - and then executes the script, then the above solutions will not work, use who am i

user=$(who am i | awk 'print $1')
echo $user