.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sat Jul 24 19:17:53 1993 by Rik Faith (faith@cs.unc.edu)
.TH GETUSERSHELL 3  "4 julio 1993" "BSD" "Manual del Programador de Linux"
.SH NOMBRE
getusershell, setusershell, endusershell \- obtener shells de usuario legales
.SH SINOPSIS
.nf
.B #include <unistd.h>
.sp
.B char *getusershell(void);
.sp
.B void setusershell(void);
.sp
.B void endusershell(void);
.fi
.SH DESCRIPCIÓN
La función \fBgetusershell()\fP devuelve la siguiente línea del fichero \fI/etc/shells\fP, abriéndolo si es necesario.  La línea debería contener la ruta de una shell de usuario válida. Si \fI/etc/shells\fP no existe o no se puede leer, \fBgetusershell()\fP se comporta como si en el fichero se encontraran las shells \fI/bin/sh\fP y \fI/bin/csh\fP.
.PP
La función \fBsetusershell()\fP reinicializa \fI/etc/shells\fP.
.PP
La función \fBendusershell()\fP cierra \fI/etc/shells\fP.
.SH "VALOR DEVUELTO"
La función \fBgetusershell()\fP devuelve un puntero NULL si se llega al fin de fichero.
.SH FICHEROS
.TP
.I /etc/shells
Fichero de base datos de shells
.SH "CONFORME A"
BSD 4.3
.SH "VÉASE TAMBIÉN"
.BR shells (5)