10-05-2012
I can't think of anything else like Ubuntu. It's not even like most Linux.
The rest of those questions are too vague to give useful answers to unfortunately.
How the many, many different kinds of UNIX and Linux are alike is the environment they provide to application programmers. The Bourne shell and a clutter of standard utilities to use with it. The open() close() socket() system calls. Standard input and output streams for processes. Device files under /dev/. The standard C library. Filesystems with a root at / and other partitions mounted wherever appropriate instead of drive letters, etc, etc, etc.
How you manage these systems, though, can be very different.
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LEARN ABOUT OPENDARWIN
fcloseall
FCLOSEALL(3) Linux Programmer's Manual FCLOSEALL(3)
NAME
fcloseall - close all open streams
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <stdio.h>
int fcloseall(void);
DESCRIPTION
The fcloseall() function closes all of the calling process's open streams. Buffered output for each stream is written before it is closed
(as for fflush(3)); buffered input is discarded.
The standard streams, stdin, stdout, and stderr are also closed.
RETURN VALUE
This function returns 0 if all files were successfully closed; on error, EOF is returned.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+------------+---------------+------------------------+
|Interface | Attribute | Value |
+------------+---------------+------------------------+
|fcloseall() | Thread safety | MT-Unsafe race:streams |
+------------+---------------+------------------------+
The fcloseall() function does not lock the streams, so it is not thread-safe.
CONFORMING TO
This function is a GNU extension.
SEE ALSO
close(2), fclose(3), fflush(3), fopen(3), setbuf(3)
COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
GNU
2017-09-15 FCLOSEALL(3)