06-07-2006
UNIX is a family of operating systems and a superset that includes Linux. There's no one single "UNIX" operating system exist, rather there are many systems that fit into family due to of core conceptions they implement. All systems of the family, including Linux of cause, share same set of basic commands, such as for file operations, editing, shells etc. However more complex issues such as system management and volume management are different as they reflect the differences in implementations and trends for brand oriented hardware.
There are many systems that you can get essentially for free: FreeBSD, Open BSD, some Linuxes and so on. Essentially, UNIX is a different OS and it may coexist with Windows on the same machine for education purposes. You can dedicate one partition to it and install any of aforementioned. If you really really new, I would recommend Mandrake Linux as it is most polished and has very convenient tools for automatic installations for beginner.
Get "UNIX Essentials and UNIX Core" DVD if you are going learn this stuff.
Hope it helps.
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LEARN ABOUT PHP
cacheflush
CACHEFLUSH(2) Linux Programmer's Manual CACHEFLUSH(2)
NAME
cacheflush - flush contents of instruction and/or data cache
SYNOPSIS
#include <asm/cachectl.h>
int cacheflush(char *addr, int nbytes, int cache);
DESCRIPTION
cacheflush() flushes the contents of the indicated cache(s) for the user addresses in the range addr to (addr+nbytes-1). cache may be one
of:
ICACHE Flush the instruction cache.
DCACHE Write back to memory and invalidate the affected valid cache lines.
BCACHE Same as (ICACHE|DCACHE).
RETURN VALUE
cacheflush() returns 0 on success or -1 on error. If errors are detected, errno will indicate the error.
ERRORS
EFAULT Some or all of the address range addr to (addr+nbytes-1) is not accessible.
EINVAL cache is not one of ICACHE, DCACHE, or BCACHE (but see BUGS).
CONFORMING TO
Historically, this system call was available on all MIPS UNIX variants including RISC/os, IRIX, Ultrix, NetBSD, OpenBSD, and FreeBSD (and
also on some non-UNIX MIPS operating systems), so that the existence of this call in MIPS operating systems is a de-facto standard.
Caveat
cacheflush() should not be used in programs intended to be portable. On Linux, this call first appeared on the MIPS architecture, but
nowadays, Linux provides a cacheflush() system call on some other architectures, but with different arguments.
BUGS
Linux kernels older than version 2.6.11 ignore the addr and nbytes arguments, making this function fairly expensive. Therefore, the whole
cache is always flushed.
This function always behaves as if BCACHE has been passed for the cache argument and does not do any error checking on the cache argument.
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/.
Linux 2017-09-15 CACHEFLUSH(2)