The archives are PGP-signed so they can be verified using this gpg key.This procedure is only recommended to advanced users who wish to completely re-flash the Yún including its U-Boot bootloader.Each revision is associated with a timestamp and the person making the change.Revisions can be compared, restored, and with some types of files, merged.Accordingly, some systems, such as git, instead consider changes to the data as a whole, which is less intuitive for simple changes but simplifies more complex changes.When data that is under revision control is modified, after being retrieved by checking out, this is not in general immediately reflected in the revision control system (in the repository), but must instead be checked in or committed.
At the simplest level, developers could simply retain multiple copies of the different versions of the program, and label them appropriately.
Today, the most capable (as well as complex) revision control systems are those used in software development, where a team of people may concurrently make changes to the same files.
Version control systems (VCS) most commonly run as stand-alone applications, but revision control is also embedded in various types of software such as word processors and spreadsheets, collaborative web docs and in various content management systems, e.g., Wikipedia's page history.
is the management of changes to documents, computer programs, large web sites, and other collections of information.
Changes are usually identified by a number or letter code, termed the "revision number", "revision level", or simply "revision".