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Full Discussion: What's your most useful shell?
Top Forums UNIX for Advanced & Expert Users What's your most useful shell? Post 302537472 by danunia on Friday 8th of July 2011 09:51:19 AM
Old 07-08-2011
style guide shell programming, or the attempt of guidance and unification
ksh & ksh93 - are my most favourite shells.

especially ksh93 and its testing, substitution, pattern matching and that like enhancements as well as its programming features.

currently i am writing a style guide for shell programming, designed for our standard company shell - which is defined to be the korn shell (ksh93).
this peace of work, once being released ...
shall become obligatory to all shell scripts and their programmers.

the poblems why i thought of a such guide were
- usage of antiquated mechanisms, which are fork- / exec-bombs and overdue since things were significantly changed in the last 18 years (..!) ;
- another is the unification of a common style - because every programmer did it how he or she thought the best way was - so no common style,
on the contrary - each programmer is a style
- propagating builtins etc.
- korn shell internal mechanisms
- and more similar propagations


but even that the standard house shell here is declared, releasing this work is still very hard and not possible !
the idea of a guide for general applliance still has to be fight strongly through, through the sensitivities and traditions and beloved shells and all what is holy for most of the people...
and of course a guide what is going to tell people how they shall program
their scripts, for to make things more efficient and also platform wide unique designed - in the first place just kicks in windows and doors and heads - not intentionally, but regrettably..

i can tell you - this struggle is sometimes similar to the discussions here, rather than always productive, its stamped most of the time by individual arbitrariness, and the love for self presentation / expression ..

must have something to do with humans in general, because watching from this perspective, world peace and balance between all the nations etc.
fail most likely because of the same 'backgrounds' ..
 

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LEARN ABOUT OPENSOLARIS

endusershell

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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