BSD 2.11 - man page for setusershell (bsd section 3)
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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 is unreadable or does not exist, getusershell
behaves as if /bin/sh and /bin/csh were listed in the file.
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.
All information is contained in a static area so it must be copied if it is to be saved.
4.3 Berkeley Distribution November 30, 1988 GETUSERSHELL(3)
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