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RedHat 9 (Linux i386) - man page for sync (redhat section 8)

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SYNC(8) 										  SYNC(8)

       sync - synchronize data on disk with memory

       sync [--help] [--version]

       sync writes any data buffered in memory out to disk.  This can include (but is not limited
       to) modified superblocks, modified inodes, and delayed reads and  writes.   This  must  be
       implemented  by	the kernel; The sync program does nothing but exercise the sync(2) system

       The kernel keeps data in memory to avoid doing (relatively slow) disk  reads  and  writes.
       This improves performance, but if the computer crashes, data may be lost or the filesystem
       corrupted as a result.  sync ensures that everything in memory is written to disk.

       sync should be called before the processor is halted in an unusual  manner  (e.g.,  before
       causing	a kernel panic when debugging new kernel code).  In general, the processor should
       be halted using the shutdown(8) or reboot(8) or halt(8) commands, which	will  attempt  to
       put  the  system in a quiescent state before calling sync(2).  (Various implementations of
       these commands exist; consult your documentation; on some  systems  one	should	not  call
       reboot(8) and halt(8) directly.)

       --help Print a usage message on standard output and exit successfully.

	      Print version information on standard output, then exit successfully.

       --     Terminate option list.

       The variables LANG, LC_ALL, LC_CTYPE, and LC_MESSAGES have the usual meaning.

       POSIX 1003.2

       On  Linux,  sync is only guaranteed to schedule the dirty blocks for writing; it can actu-
       ally take a short time before all the blocks  are  finally  written.   The  reboot(8)  and
       halt(8)	commands  take	this  into  account  by  sleeping for a few seconds after calling

       This page describes sync as found in the fileutils-4.0 package; other versions may  differ
       slightly.   Mail  corrections  and additions to aeb@cwi.nl.  Report bugs in the program to

       sync(2), halt(8), reboot(8), update(8)

GNU fileutils 4.0			     1998-11					  SYNC(8)
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