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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
Old 12-28-2014
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 Górniczo-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 systemów Unix).
 

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chsh(1) 						      General Commands Manual							   chsh(1)

NAME
chsh - change default login shell SYNOPSIS
login-name [shell] login-name [shell] login-name [shell] login-name [shell] DESCRIPTION
The command changes the login-shell for a user's login name in the repository (see passwd(1)). The DCE repository is only available if Integrated Login has been configured; see auth.adm(1M). If Integrated Login has been configured, other considerations apply. A user with appropriate DCE privileges is capable of modifying a user's shell; this is not dependent upon superuser privileges. If the repository is not specified (as in [login-name]), the login shell is changed in the file only. Run after running to make sure the information was processed correctly. Notes The command is a hard link to the command. When is executed, actually the command gets executed with appropriate arguments to change the user login shell in the repository specified in command line. If no repository is specified, the login shell is changed in the file. Arguments login-name A login name of a user. shell The absolute path name of a shell. If the file exists, the new login shell must be listed in that file. Otherwise, you can specify one of the standard shells listed in the getusershell(3C) manual entry. If shell is omitted, it defaults to the POSIX shell, Options The following option is recognized: Specify the repository to which the operation is to be applied. Supported repositories include and Security Restrictions You must have appropriate privileges to use the optional login-name argument to change another user's login shell. NETWORKING FEATURES
NFS File can be implemented as a Network Information Service (NIS) database. EXAMPLES
To change the login shell for user to the default: To change the login shell for user to the C shell: To change the login shell for user to the Korn shell in the DCE registry: WARNINGS
If two or more users try to write the file at the same time, a passwd locking mechanism was devised. If this locking fails after subse- quent retrying, terminates. AUTHOR
was developed by HP and the University of California, Berkeley. FILES
SEE ALSO
chfn(1), csh(1), ksh(1), passwd(1), sh(1), sh-posix(1), getusershell(3C), pam(3), passwd(4), shells(4). chsh(1)
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