.TH SYNC 2 2/13/83 .SH NAME sync \- update super-block .SH SYNOPSIS .B sync() .SH DESCRIPTION .I Sync causes all information in core memory that should be on disk to be written out. This includes modified super blocks, modified i-nodes, and delayed block I/O. .PP It should be used by programs which examine a file system, for example .I "icheck, df," etc. It is mandatory before a boot. .SH "SEE ALSO" fsync(2), sync(8), update(8) .SH BUGS The writing, although scheduled, is not necessarily complete upon return from .IR sync .