Commit | Line | Data |
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b42074ab | 1 | .\" @(#)update.8 6.2 (Berkeley) 6/24/90 |
1f137805 | 2 | .\" |
b42074ab CL |
3 | .\" %sccs.include.redist.man% |
4 | .\" | |
5 | .\" @(#)update.8 6.3 (Berkeley) %G% | |
6 | .\" | |
7 | .Dd | |
8 | .Dt UPDATE 8 | |
9 | .Os ATT 7th | |
10 | .Sh NAME | |
11 | .Nm update | |
12 | .Nd flush internal filesystem caches to disk frequently | |
13 | .Sh SYNOPSIS | |
14 | .Nm update | |
15 | .Sh DESCRIPTION | |
16 | The | |
17 | .Nm update | |
18 | command helps protect the integrity of disk volumes | |
19 | by flushing | |
20 | voliatile cached filesystem data | |
21 | to disk at thirty second intervals. | |
22 | .Nm Update | |
23 | uses the | |
24 | .Xr sync 2 | |
25 | function call to do the task. | |
26 | .Pp | |
27 | .Nm Update | |
28 | is commonly invoked at startup time by | |
29 | .Xr rc 8 | |
30 | when the system goes multi-user. | |
31 | .Sh SEE ALSO | |
32 | .Xr sync 2 , | |
33 | .Xr fsck 8 , | |
34 | .Xr init 8 , | |
35 | .Xr rc 8 , | |
36 | .Xr sync 8 | |
37 | .Sh BUGS | |
38 | It is possible on some systems, that a | |
39 | .Nm sync | |
40 | occuring simultaneously with a crash may cause | |
41 | file system damage. See | |
42 | .Xr fsck 8 . | |
43 | .Sh HISTORY | |
44 | An | |
45 | .Nm | |
46 | command appeared in Version 6 AT&T UNIX. |