GETUSERSHELL(3) Library Functions Manual GETUSERSHELL(3)
getusershell, setusershell, endusershell - get legal user shells
getusershell() 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 four locations of the two standard system shells /bin/sh,
/bin/csh, /usr/bin/sh and /usr/bin/csh are returned.
getusershell() reads the next line (opening the file if necessary);
setusershell() rewinds the file; endusershell() closes it.
The routine getusershell() returns a NULL pointer (0) on EOF or error.
All information is contained in a static area so it must be copied if
it is to be saved.
6 October 1987 GETUSERSHELL(3)