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Homework and Emergencies Homework & Coursework Questions How to set a non-login non-interactive shell for a user? Post 302929992 by RudiC on Monday 29th of December 2014 10:45:29 AM
Old 12-29-2014
While I've some difficulty understanding the problem (item 2. in post #1), let me try to clarify some things:
On a system, you have login users (A) and non-login users (B). And, you have interactive (C) and non-interactive (D) access.
Combinations:
A+C is the normal user, logged in via a terminal (his interaction tool).
A+D can be a background process run by a logged in user, supplying the -l option to e.g. bash.
B+C would be an interactive shell run as a subprocess / subshell by an application.
B+D could be a service or a daemon started at boot time and running under a B user.

The command /usr/sbin/nologin (/bin/non-login I do not know about) is NOT a shell, but it prevents the respective user to log in.
Shells are command line interpreters (CLI) that enable the user to interact with the system. If your system has /ets/shells, list that to see some available shells:
Code:
linux:
/bin/sh
/bin/dash
/bin/bash
/bin/rbash
or (Free)BSD:
/bin/csh
/bin/tcsh
/usr/local/bin/bash
/usr/local/bin/rbash

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getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. SunOS 5.10 30 Aug 2004 getusershell(3C)
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