How to set a non-login non-interactive shell for a user? Post: 302929897

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Homework and Emergencies Homework & Coursework Questions How to set a non-login non-interactive shell for a user? Post 302929897 by me_me_me on Sunday 28th of December 2014 06:42:43 PM

12-28-2014

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How to set a non-login non-interactive shell for a user?

I am sorry for creating a new topic after my previous inquiry was closed, but I tried and tried and I do not know how to edit my previous post. This is not exactly any homework, this is one of 40 questions we were expected to prepare for one of the labs. I searched and read what I could and still do not know the answer to this problem.

1. The problem statement, all variables and given/known data:
I am a root in a Unix system. My shell is bash.

2. Relevant commands, code, scripts, algorithms:
How to set for a certain user:
* a non-login interactive shell,
* a login, non-interactive shell,
* a non-login, non-interactive shell.

3. The attempts at a solution (include all code and scripts):
I read everything I could find, I only found information which files are read by different types of shells. I cannot find anywhere how to change a shell for a user to make it:
- noninteractive and non-login,
- non-interactive and login,
- interactive and non-login.

What I know:
I can use useradd or adduser with -s option to set a certain shell, but I do not know what to write after this option.
I know that I can edit /etc/passwd file and for a certain user change the last column to /bin/non-login. I do not know what shell version I get if I do it. It will be non-login allright but interactive or non-interactive?

4. Complete Name of School (University), City (State), Country, Name of Professor, and Course Number (Link to Course):
name: Akademia G�rniczo-Hutnicza w Krakowie
city: Cracow
country: Poland,
Name of Professor: Grzegorz Nalepa, Krzysztof Kluza

Link to the course (I was not allowed by some mechanism on this website to post any URLs but I am required to do so by the formular therefore I re-wrote the link to the course that the site does recognise that it is a URL: [eidz ti ti pi colon slash slash ai dot ia dot agh dot edu dot pl slash wiki slash pl colon dydaktyka colon unix colon start ]

We do not use numbers for the courses so I cannot provide any course number. It is called Introduction to Unix (Wstęp do system�w Unix).

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LEARN ABOUT PLAN9

chsh

CHSH(1)                                                            User Commands                                                           CHSH(1)

NAME

       chsh - change login shell

SYNOPSIS

       chsh [options] [LOGIN]

DESCRIPTION

       The chsh command changes the user login shell. This determines the name of the user's initial login command. A normal user may only change
       the login shell for her own account; the superuser may change the login shell for any account.

OPTIONS

       The options which apply to the chsh command are:

       -h, --help
           Display help message and exit.

       -R, --root CHROOT_DIR
           Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.

       -s, --shell SHELL
           The name of the user's new login shell. Setting this field to blank causes the system to select the default login shell.

       If the -s option is not selected, chsh operates in an interactive fashion, prompting the user with the current login shell. Enter the new
       value to change the shell, or leave the line blank to use the current one. The current shell is displayed between a pair of [ ] marks.

NOTE

       The only restriction placed on the login shell is that the command name must be listed in /etc/shells, unless the invoker is the superuser,
       and then any value may be added. An account with a restricted login shell may not change her login shell. For this reason, placing /bin/rsh
       in /etc/shells is discouraged since accidentally changing to a restricted shell would prevent the user from ever changing her login shell
       back to its original value.

FILES

       /etc/passwd
           User account information.

       /etc/shells
           List of valid login shells.

       /etc/login.defs
           Shadow password suite configuration.

SEE ALSO

       chfn(1), login.defs(5), passwd(5).

shadow-utils 4.5                                                    01/25/2018                                                             CHSH(1)

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