Command line arguments Lab and inputs

Shell Scripting
#1

Lab: Command line arguments and inputs isn’t working due to permission issue?

update_shell
update_shell1514×853 117 KB

here the corrected code:

new_shell=$2
user_name=$1

usermod -s $user_name $new_shell

Output:

bash update_shell.sh /bin/bash adminako
usermod: Permission denied.
usermod: cannot lock /etc/passwd; try again later.

What should be the solution, please?

#2

That output doesn’t seem to tie in with what you get without changing the script.

I get this:

bob@caleston-lp10:~$ bash update_shell.sh bob bash
usermod: user 'bash' does not exists

I would advise looking at the order of the inputs in the script, the error on the right gives a hint.

#3

Thanks @Rosarch

Correct and I’ve changed the sequence to:
bob@caleston-lp10:~$ bash update_shell.sh /bin/bash bob

though it worked fine on my workstation with privilege of course. The command changes the user shell. In spite of switching the attribute in the Kodekloud lab, I still get the error.

----- on my workstation —

user@mintlt:~$ cat update_shell.sh 
new_shell=$2
user_name=$1

usermod -s $user_name $new_shell

user@mintlt:~$ bash update_shell.sh /bin/sh adminako
usermod: no changes

user@mintlt:~$ bash update_shell.sh /bin/bash adminako
usermod: Permission denied.
usermod: cannot lock /etc/passwd; try again later.

user@mintlt:~$ sudo bash update_shell.sh /bin/bash adminako
[sudo] password for user:

user@mintlt:~$ cat /etc/passwd |grep adminako
adminako:x:1001:1001::/home/adminako:/bin/bash

#4

This lab is a bit confusing…

What I changed to clear the check:

bob@caleston-lp10:~$ more update_shell.sh
new_shell="$2"
user_name="$1"
usermod -s $new_shell $user_name
#5

Yes indeed confusing.

#6

Hi

In my case user is bob home directory, i tried command
“bash update_shell.sh /bin/sh bob” got permission denied. then i used sudo in the command,

image

Can you please let me know what password do we have to use here.

#7

I don’t believe you need the password as long as the script is right it will pass on the task check.

#8

Hi - for all labs use caleston123 as the password.

The error in the script is more of a syntax error of the usermod command.

It should be : usermod -s <new_shell absolute path> <user_name>
usermod -s /bin/bash bob

#9

Thanks for replying.

I’m still confused, can someone please let me know what exactly the script should be.

image

#10

There is a logic issue or Am I missing a step? user bob is currently logged in and how can he update the info in /etc/passwd?
bob@caleston-lp10:~$ ./update_shell.sh /bin/sh bob
usermod: Permission denied.
usermod: cannot lock /etc/passwd; try again later.