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Full Discussion: help me out in letting me know the meaning of sh, ksh, bash
Top Forums Shell Programming and Scripting help me out in letting me know the meaning of sh, ksh, bash Post 302331185 by Scott on Saturday 4th of July 2009 11:51:51 AM
Old 07-04-2009
The first line of a script specifies what "language" the script is written in (and should be used to execute what follows).

Code:
#!/bin/sh       - means Bourne shell
#!/bin/ksh      - means Korn shell
#!/bin/bash     - means Bourne Again shell
#!/usr/bin/perl - means Perl

Code:
#!/bin/bash
t=100            - sets a variable called t to 100
echo $t          - prints the value of variable t
echo $tea        - prints the value of variable tea
echo ${t}ea      - prints the value of t followed by the literal characters ea

{ and } are used to separate a variable name from other text - otherwise the shell can't distinguish the variable name from the other text.
Last edited by Scott; 07-04-2009 at 01:43 PM..
 

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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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