JPH02278350A - Date file automatic generation system - Google Patents

Abstract

PURPOSE:To make it possible to see a date on which a file contained in a directory was corrected most recently by generating automatically the file whose file name is the date of the change of the contents of the file in directory when the change arises in the contents of the file in the directory. CONSTITUTION:For every directory, when the change arises in the contents of one or plural files contained in this directory by the access of a program, the file whose file name is a character string to represent the date of the change is generated automatically at the point of the time of the finish of that access. For instance, in the case of UNIX, since 'f open( )' or 'open ( ) system call' is used for opening the file, file system can always know the access to the file in a specified directory, and also, can know the mode of the access. Thus, if a means to make a remarked directory is assembled in the file system, it becomes possible to generate the date file when the change arises in the contents of the directory.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the automatic generation of files in a computer file system.

[Conventional technology]

Conventionally, in file systems that manage programs, data, etc. as files on a per-directory basis, the date of creation and date of modification are recorded as file attributes along with the contents of the file. Also,
A directory in a file system is just like a single file.

Or the date the directory was created.

The modified date was recorded as an attribute. Example or
“The Design or
theUNTX Operating 5yste@(
Prentie-Hall, 1986), Section 4.1 (pp, 61-67), on UNIX file systems. The date attribute of files and directories is described as the date attribute of one node, which is a unit of physical area on the disk of the file and directories.

[Problem to be solved by the invention]

Traditionally, when a user wants to know the most recent update date of a file stored in one directory, the user starts a program that displays the attributes of the file,
The modification dates of all files stored in that directory were displayed, and the user visually compared them. As the number of files included in the directory increases, such manual work becomes difficult and the possibility of making errors increases, creating problems in managing the files. Especially when backing up files, it is recommended to save files in directories that have changed since the previous backup in order to make the backup work more efficient and to minimize the amount of storage media required for backup. In such cases, the work was difficult and there were two issues.

The present invention has been made in order to solve the problems in such file systems.

[Means to solve the problem]

In the method according to the present invention, the system according to the present invention can be used for any of the following:

If the contents of one or more files contained in the file change (including newly created files) as a result of access to the Gologram, the character string representing the current date will be added to the file name at the end of the access. A file is automatically generated.

[For production]

In the automatic generation of a date file in the present invention, when a change occurs due to a program accessing the contents of a file included in a directory, a new file is created with the file name of the date when the change occurred.

〔Example〕

Two embodiments of the present invention are shown below.

Figure 1 shows the procedure for creating a two-date file. 00) is the start of the process. (201ζ) is the process of obtaining date data held by the computer system using a system call and storing it in the variable DATE.

(30) is the process of converting the date data stored in DATE into a human-readable character string and storing it in the variable DSTR.

(40) is the process of obtaining the current directory name using a system call and storing it in the variable DIR, (SO)
is the process of opening file F in write mode whose file name is the date character string DSTR obtained in process (30), and (SO) is the process of opening file F in write mode with the name of the date character string DSTR obtained in process (30). The process of storing.

(70) is the process of closing file F, (11
101 indicates the end of the process.

FIG. 2 shows an example using a program that reproduces the procedure shown in FIG. Figure 2(a) is.

It shows the state of the BUILEF before using this program, and shows the four files BIue, White.
, Red.

Indicates that Green is present. Figure 2 (bl shows the state of the directory CoIor after using this program. In Figure 2 (b), file 890322 is a date file with a file name indicating the 2nd date "March 22, 1989". ing.

By incorporating a program that implements the above date file creation procedure into the file system, this program can be started when a new file in a specific directory is created or when a file is modified. do. 2 For example, in UNIX, to open a file, the fopen() or open() system call is used, so the file system always knows how to access a specific directory or file. and also know the mode of access (read, write, etc.).

Therefore, if a means for marking the desired directory is built into the file system.

A date file can be created when the contents of a directory change. How to mark the bulletin board (this can be realized in various ways, but 2, for example,
It is conceivable to add a flag corresponding to such a mark to the attributes of the directory file.

〔Effect of the invention〕

As described above, according to the second aspect of the present invention, when a change occurs in the contents of a file in the library, a file whose file name is the date at that time is automatically generated. This has the effect of allowing the user to view the most recent modification date of a file contained in two directories without having to display file attributes and perform a visual comparison.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the processing procedure. Figure 2 shows the file le ・Buylev to FIG.

Claims (1)

[Claims] In a file system that manages programs, data, etc. as files in each directory, if a program accesses each directory and the contents of one or more files in that directory change, the program At the end of access,
An automatic date file generation method characterized by automatically generating a date file whose file name is a character string representing the current date.