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Full Discussion: default shell for the user
Top Forums UNIX for Dummies Questions & Answers default shell for the user Post 302590275 by pandeesh on Sunday 15th of January 2012 12:09:09 PM
Old 01-15-2012
Thanks!
I have tried the below code for listing out all the shells:
Code:
#!/bin/bash
echo $SHELL
#!/bin/sh
echo $SHELL
#!/bin/csh
echo $SHELL
#!/bin/ksh
echo $SHELL
#!/bin/csh
echo $SHELL
#!/bin/zsh
echo $SHELL
#!/bin/ash
echo $SHELL

But i have got the result as:
Code:
/bin/bash
/bin/bash
/bin/bash
/bin/bash
/bin/bash
/bin/bash
/bin/bash

After that i have understood that
Code:
echo $0

is giving the subshell.
So i have changed the script to:
Code:
#!/bin/bash
echo $0
#!/bin/sh
echo ${0}
#!/bin/csh
echo ${0}
#!/bin/ksh
echo ${0}
#!/bin/csh
echo $0
#!/bin/zsh
echo $0
#!/bin/ash
echo $0

But i am getting :
Code:
pandeeswaran@ubuntu:~$ ./shells_1
./shells_1
./shells_1
./shells_1
./shells_1
./shells_1
./shells_1
./shells_1

Please help me to achieve to list out the shells.

Thanks
 

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LEARN ABOUT OPENSOLARIS

setusershell

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/ksh93		    /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/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/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.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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