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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

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