getusershell, setusershell, endusershell - get legal user
The getusershell() function returns a pointer to a legal user shell as
defined by the system manager in the file /etc/shells. If
unreadable or does not exist, getusershell() behaves as if
and /bin/csh were listed in the file.
The getusershell() function reads the next line (opening the
file if necessary);
setusershell() rewinds the file; endusershell()
The routine getusershell() returns a null pointer EOF.
The getusershell() function appeared in 4.3BSD.
The getusershell() function leaves its result in an internal
and returns a pointer to that object. Subsequent calls
getusershell() will modify the same object.
OpenBSD 3.6 June 4, 1993
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