05-15-2016
Hi drl,
The topic of using env as a _silver bullet_ for portability in the Unices world has been discussed extensively on many forums and a quick search on the Net will produce many of those conversations.
Your experience, certainly, will contribute to how strongly you feel about a particular topic. However, portability is an elusive concept, as much as we would like to believe not so. The classic _it has worked for me for so many years_ or _I have never had a problem with it_ does not produce an assurance of portability, neither. And since this could be a call to _holy war_ for many, I would like to leave it there, on my part.
My original objective was to bring awareness that by using env you might be trading a _minor_ inconvenience (merely the need to know what systems you are coding for) for a whole new set of issues.
Thank you for including my post.
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LEARN ABOUT SUNOS
getusershell
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)