POSIX ustar format
E299200
POSIX ustar format is a standardized tar archive format defined by POSIX to ensure portable storage of file metadata and contents across Unix-like systems.
All labels observed (2)
| Label | Occurrences |
|---|---|
| POSIX ustar format canonical | 2 |
| POSIX file archive utilities specification | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2792620 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: POSIX ustar format Context triple: [GNU Tar, supportsFeature, POSIX ustar format]
-
A.
Universal 2 binary format
Universal 2 binary format is Apple’s macOS application packaging format that combines both Intel and Apple silicon (ARM) executables into a single app bundle for seamless cross-architecture support.
-
B.
ISO 9660
ISO 9660 is an international standard file system format primarily used for optical disc media such as CD-ROMs to ensure cross-platform data compatibility.
-
C.
GNU Tar
GNU Tar is a widely used free software utility for creating, maintaining, modifying, and extracting files from archive files, especially on Unix-like systems.
-
D.
HFS Plus
HFS Plus is a proprietary journaling file system developed by Apple for use in macOS and earlier Macintosh operating systems, succeeding the original HFS to support larger files and volumes.
-
E.
ext4
ext4 is a widely used, journaling fourth-generation extended file system for Linux, designed for improved performance, reliability, and support for large volumes and files.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: POSIX ustar format Target entity description: POSIX ustar format is a standardized tar archive format defined by POSIX to ensure portable storage of file metadata and contents across Unix-like systems.
-
A.
Universal 2 binary format
Universal 2 binary format is Apple’s macOS application packaging format that combines both Intel and Apple silicon (ARM) executables into a single app bundle for seamless cross-architecture support.
-
B.
ISO 9660
ISO 9660 is an international standard file system format primarily used for optical disc media such as CD-ROMs to ensure cross-platform data compatibility.
-
C.
GNU Tar
GNU Tar is a widely used free software utility for creating, maintaining, modifying, and extracting files from archive files, especially on Unix-like systems.
-
D.
HFS Plus
HFS Plus is a proprietary journaling file system developed by Apple for use in macOS and earlier Macintosh operating systems, succeeding the original HFS to support larger files and volumes.
-
E.
ext4
ext4 is a widely used, journaling fourth-generation extended file system for Linux, designed for improved performance, reliability, and support for large volumes and files.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
file archive format
ⓘ
tar archive format ⓘ |
| alsoKnownAs |
POSIX tar format
ⓘ
ustar ⓘ |
| backwardsCompatibleWith | traditional Unix V7 tar format ⓘ |
| blockTermination | two 512-byte blocks of zero bytes at end of archive ⓘ |
| category | archive file format ⓘ |
| checksumAlgorithm | simple unsigned byte sum over header ⓘ |
| definedIn |
IEEE Std 1003.1
ⓘ
linked to:
POSIX
POSIX.1 ⓘ
linked to:
POSIX
|
| designedFor | interoperability between different Unix implementations ⓘ |
| extendedBy |
GNU tar format
ⓘ
linked to:
GNU Tar
POSIX pax interchange format ⓘ |
| fileNameFieldLength | 100 bytes ⓘ |
| fileTypeSupport |
FIFO
ⓘ
block device ⓘ character device ⓘ directory ⓘ hard link ⓘ regular file ⓘ symbolic link ⓘ |
| headerBlockSize | 512 bytes ⓘ |
| limitation |
cannot represent very large files beyond octal size field limit
ⓘ
cannot represent very long path names beyond prefix limit ⓘ |
| magicField | "ustar" ⓘ |
| magicFieldLength | 6 bytes ⓘ |
| prefixFieldLength | 155 bytes ⓘ |
| purpose | portable storage of file metadata and contents ⓘ |
| recordSize | multiple of 512 bytes ⓘ |
| standardizedBy | POSIX ⓘ |
| stores |
checksum
ⓘ
device major number ⓘ device minor number ⓘ file mode ⓘ file name ⓘ file size ⓘ file type flag ⓘ group ID ⓘ group name ⓘ link name ⓘ modification time ⓘ prefix for long path names ⓘ user ID ⓘ user name ⓘ |
| supportsPathLengthUpTo | 256 characters ⓘ |
| usedOn | Unix-like systems ⓘ |
| versionField | "00" ⓘ |
| versionFieldLength | 2 bytes ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: POSIX ustar format Description of subject: POSIX ustar format is a standardized tar archive format defined by POSIX to ensure portable storage of file metadata and contents across Unix-like systems.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.