.TH UPDATE 8 .SH NAME update \- periodically update the super block .SH SYNOPSIS .B /etc/update .SH DESCRIPTION .I Update is a program that executes the .IR sync (2) primitive every 30 seconds. This insures that the file system is fairly up to date in case of a crash. This command should not be executed directly, but rather out of the initialization shell command file .IR rc (8). .SH "SEE ALSO" sync(2), sync(8), init(8)