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(Redirected from PKUNZIP)
PKZIP is a file archivingcomputer program, notable for introducing the popular ZIP file format. PKZIP was first introduced for MS-DOS on the IBM-PC compatible platform in 1989. Since then versions have been released for a number of other architectures and operating systems. PKZIP was originally written by Phil Katz and marketed by his company PKWARE, Inc, with both of them bearing his initials: 'PK'.
History[edit]
By the 1970s, file archiving programs were distributed as standard utilities with operating systems. They include the Unix utilities ar, shar, and tar. These utilities were designed to gather a number of separate files into a single archive file for easier copying and distribution. These archives could optionally be passed through a stream compressor utility, such as compress and others.
Other archivers also appeared during the 1980s, including ARC by System Enhancement Associates, Inc. (SEA), Rahul Dhesi's ZOO, Dean W. Cooper's DWC, LHarc by Haruhiko Okomura and Haruyasu Yoshizaki and ARJ which stands for 'Archived by Robert Jung'.
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The development of PKZIP was first announced in the file SOFTDEV.DOC from within the PKPAK 3.61 package, stating it would develop a new and yet unnamed compression program. The announcement had been made following the lawsuit between SEA and PKWARE, Inc. Although SEA won the suit, it lost the compression war, as the user base migrated to PKZIP as the compressor of choice. Led by BBSsysops who refused to accept or offer files compressed as .ARC files, users began recompressing any old archives that were currently stored in .ARC format into .ZIP files.
The first version was released in 1989, as a DOS command-line tool, distributed under shareware model with a US$25 registration fee (US$47 with manual).
Version history[edit]PKZIP[edit]
SecureZIP[edit]
.ZIP file format[edit]
To help ensure the interoperability of the ZIP format, Phil Katz published the original .ZIP File Format Specification in the APPNOTE.TXT documentation file. PKWARE continued to maintain this document and periodically published updates.[19] Originally only bundled with registered versions of PKZIP, it was later available on the PKWARE site.[19]
The specification has its own version number, which does not necessarily correspond to the PKZIP version numbers, especially with PKZIP 6 or later. At various times, PKWARE adds preliminary features that allows PKZIP products to extract archives using advanced features, but PKZIP products that create such archives won't be available until the next major release.
Compatibility[edit]
Although popular at the time, ZIP archives using PKZIP 1.0 compression methods are now rare, and many modern unzip tools[which?] are unable to handle 'shrinking' and 'reducing', although 'imploding' is usually supported.
Patents[edit]
Shrinking uses dynamic LZW, on which Unisys held patents. A patent for the Reduce Algorithm had also been filed on June 19, 1984, long before PKZIP was produced.[20]
Other products[edit]
PKWARE also used its PKZIP standards on following products:
See also[edit]References[edit]
External links[edit]Official[edit]![]()
Other[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=PKZIP&oldid=919203769'
Run the WMIC CommandOpen a Command Prompt window to get started. On Windows 10 or 8, right-click the Start button and select “Command Prompt”. On Windows 7, press Windows + R, type “cmd” into the Run dialog, and then press Enter.At the Command Prompt, type the following command and then press Enter: wmic bios get serialnumberYou’ll see the computer’s serial number displayed beneath the text “SerialNumber”. This command uses the Windows Management Instrumentation Command-line (WMIC) tool to pull the system’s serial number from its BIOS.If you don’t see your PC’s serial number, blame your PC’s manufacturer.
The number will only appear here if the PC manufacturer saved it to your computer’s BIOS or UEFI firmware. PC manufacturers don’t always fill in the number properly. In that case, you’ll see something like “0” or “To be filled by O.E.M.” instead of an actual serial number.RELATED:This is also true if you built your own PC because the PC itself won’t have a serial number. However, you can and other components. Check the BIOSYou may also be able to find the serial number in the BIOS or UEFI firmware settings screen. This technique won’t get you a serial number if the wmic command didn’t, since the command pulls the serial number from the BIOS. However, checking the BIOS could be helpful if you can’t actually sign into Windows to run the wmic command.RELATED:and look around for a “Serial Number” somewhere on a system information screen.
It’ll be in a different place on different PCs, but you can usually find it somewhere on the “Main” or “System” screen. Find the Serial Number On the PC’s Hardware, Box, or ElsewhereIf you don’t see a serial number after running the wmic command—or if you just can’t turn the PC on or don’t have access to it—there are several other places you might find the serial number:. If you have a laptop, flip it over. On some laptops, you’ll see the number on a sticker. On others, you’ll see the number printed directly on the metal or plastic the laptop is made from.
If your laptop has a removable battery, the serial number is sometimes on a sticker inside the battery compartment, under the battery. If you have a desktop PC, look at the back, top, or side of the case for some sort of sticker. The number may also be on a sticker inside the case, so you might have to open it up. If you can’t find the serial number on the PC itself, look online for instructions specific to your model.
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