UPDATE(8) BSD System Manager's Manual UPDATE(8)NAME
update -- flush internal filesystem caches to disk frequently
SYNOPSIS
update
DESCRIPTION
The update utility has been incorporated into launchd(8). It historically helped protect the integrity of disk volumes by flushing volatile
cached filesystem data to disk at thirty second intervals using the sync(2) function call.
SEE ALSO sync(2), fsck(8), launchd(8), sync(8)BUGS
It is possible on some systems that a sync occurring simultaneously with a crash may cause file system damage. See fsck(8).
HISTORY
An update utility appeared in Version 6 AT&T UNIX.
BSD August 18, 2008 BSD
Check Out this Related Man Page
SYNCER(4) BSD Kernel Interfaces Manual SYNCER(4)NAME
syncer -- file system synchronizer kernel process
SYNOPSIS
syncer
DESCRIPTION
The syncer kernel process helps protect the integrity of disk volumes by flushing volatile cached file system data to disk.
The kernel places all vnode(9)'s in a number of queues. The syncer process works through the queues in a round-robin fashion, usually pro-
cessing one queue per second. For each vnode(9) on that queue, the syncer process forces a write out to disk of its dirty buffers.
The usual delay between the time buffers are dirtied and the time they are synced is controlled by the following sysctl(8) tunable variables:
Variable Default Description
kern.filedelay 30 time to delay syncing files
kern.dirdelay 29 time to delay syncing directories
kern.metadelay 28 time to delay syncing metadata
SEE ALSO sync(2), fsck(8), sync(8), sysctl(8)HISTORY
The syncer process is a descendant of the 'update' command, which appeared in Version 6 AT&T UNIX, and was usually started by /etc/rc when
the system went multi-user. A kernel initiated 'update' process first appeared in FreeBSD 2.0.
BUGS
It is possible on some systems that a sync(2) occurring simultaneously with a crash may cause file system damage. See fsck(8).
BSD July 14, 2000 BSD
I have followed instructions to get the jdk for sparc, 1.3 loaded on this sparc workstation machine. I used a tar file and everything seemed to go fine. The usr/j2se directory was created with all the subdirectories and java files. However, attempting to run Java commands fails with a file not... (18 Replies)
Hi,
I am trying to update a MASTER file by a NEW file which may contain fewer records.
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a;b;0
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NEW:
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can you recommend me a way to do it?
10x
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