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Full Discussion: Build script for all shells
Top Forums Shell Programming and Scripting Build script for all shells Post 69268 by google on Wednesday 13th of April 2005 01:12:36 PM
Old 04-13-2005
The OP is attempting to write a shell that runs under all shells (not specific to bourne) and by not specifying a magic number in the script.

Again, the script you are building would have to be built with the lowest common denominator of shell functionality common to all shells. As criglerj pointed out, you must exclusively use syntax that is common to all shells to get this project to work.
 

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GETUSERSHELL(3) 					     Linux Programmer's Manual						   GETUSERSHELL(3)

NAME
getusershell, setusershell, endusershell - get permitted user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): getusershell(), setusershell(), endusershell(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500) DESCRIPTION
The getusershell() function returns the next line from the file /etc/shells, opening the file if necessary. The line should contain the pathname of a valid user shell. If /etc/shells does not exist or is unreadable, getusershell() behaves as if /bin/sh and /bin/csh were listed in the file. The setusershell() function rewinds /etc/shells. The endusershell() function closes /etc/shells. RETURN VALUE
The getusershell() function returns a NULL pointer on end-of-file. FILES
/etc/shells CONFORMING TO
4.3BSD. SEE ALSO
shells(5) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2007-07-26 GETUSERSHELL(3)
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