View source for Share (command)

{{Lowercase title}}
{{Infobox software 
| name                   = share
| logo                   = 
| screenshot             = 
| screenshot size        = 
| caption                = 
| developer              = [[Microsoft]], [[Paragon Software Group|Paragon Technology Systems]], [[Digital Research|DR]], [[Datalight]], [[Novell]], Ron Cemer
| released               = {{Release year|df=yes|1984}}
| latest release version = 
| latest release date    = 
| operating system       = [[MS-DOS]], [[PTS-DOS]], [[SISNE plus]], [[Microsoft Windows|Windows]], [[DR DOS]], [[ROM-DOS]], [[FreeDOS]]
| genre                  = [[Command (computing)|Command]]
| license                = 
| website                = 
}}
In [[computing]], '''<code>share</code>''' is a [[command (computing)|command]] for [[DOS]] that allows software to perform [[file lock]]s. Locking files became necessary when [[MS-DOS]] began allowing files to be accessed simultaneously by multiple programs, either through [[computer multitasking|multitasking]] or [[computer networking|networking]].<ref name="Jamsa1993">{{Citation
 | last1     = Jamsa
 | first1    = Kris A.
 | title     = DOS: The Complete Reference
 | publisher = [[Osborne McGraw-Hill]]
 | page      = 206
 | year      = 1993
 | isbn      = 0078819040
 | url       = https://books.google.com/books?id=UW9GAAAAYAAJ
 | postscript= .
}}</ref><ref>{{cite web|url=http://www.easydos.com/share.html|title=DOS Command: SHARE}}</ref><ref>[http://www.computerhope.com/sharehlp.htm MS-DOS and Windows command line share command]</ref>

==Implementations==
On MS-DOS, the command is available in  versions 3 and later.<ref name="RUNNINGMSDOS">{{Cite book|author-last=Wolverton|author-first=Van|title=Running MS-DOS Version 6.22 (20th Anniversary Edition), 6th Revised edition|date=2003|publisher=[[Microsoft Press]]|isbn=0-7356-1812-7}}</ref> The command is also available in [[FreeDOS]],<ref>{{cite web|url=http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/pkg-html/group-base.html |title=FreeDOS 1.2 Updates Group - FreeDOS Base |publisher=Ibiblio.org |date= |accessdate=2022-09-08}}</ref> [[PTS-DOS]],<ref>
{{cite web |title=PTS-DOS 2000 Pro User Manual |publisher=[[Paragon Technology GmbH]] |location=Buggingen, Germany |date=1999 |url=http://download.paragon-software.com/doc/manual_dos_eng.pdf |access-date=2018-05-12 |url-status=live |archive-url=https://web.archive.org/web/20180512094512/http://download.paragon-software.com/doc/manual_dos_eng.pdf |archive-date=2018-05-12}}</ref> and [[SISNE plus]].<ref>[https://datassette.org/manuais/ibm-pc/sisne-plus-referencia-sumaria SISNE plus - Referência Sumária | Datassette]</ref> The FreeDOS version was developed by Ron Cemer and is licensed under the [[GNU General Public License|GPL]].<ref>{{cite web|url=http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.2/repos/pkg-html/share.html |title=FreeDOS 1.2 Updates Package - share (FreeDOS Base) |publisher=Ibiblio.org |date=2007-10-20 |accessdate=2022-09-08}}</ref> [[DR DOS 6.0]]<ref name="drdos6userguide">[https://www.4corn.co.uk/archive/docs/DR%20DOS%206.0%20User%20Guide-opt.pdf DR DOS 6.0 User Guide Optimisation and Configuration Tips]</ref> and [[Datalight]] [[ROM-DOS]]<ref>{{cite web|url=https://www.datalight.com/assets/files/ROM-DOS_Users_Guide.pdf|title=Datalight ROM-DOS User's Guide|website=www.datalight.com}}</ref> include an implementation of the {{code|share}} command.

[[Windows XP]] and later versions include [[16-bit]] commands (nonnative) for the [[Virtual DOS machine|MS-DOS subsystem]] that are included to maintain MS-DOS compatibility. The <code>share</code> MS-DOS subsystem command performs functions that are now inherent to [[Microsoft Windows]]. It is available to preserve compatibility with existing files, but has no effect at the [[command-line interface|command line]] because the functionality is automatic. The 16-bit MS-DOS subsystem commands are not available on [[64-bit]] editions of Windows.<ref>[https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-xp/bb490895(v%3dtechnet.10) MS-DOS subsystem commands]</ref>

==Design==
There were five locking modes:

*Deny None
*Deny Read
*Deny Write
*Deny All
*Compatibility (designed for [[backward compatibility]] with existing MS-DOS programs)

The program runs as a [[terminate-and-stay-resident program]] and is typically loaded at boot-up.

==Syntax==
 share [/F:space] [/L:locks]

*'''<code>/F:space</code>''' Allocates file space (in bytes) for file-sharing information.
*'''<code>/L:locks</code>''' Sets the number of files that can be locked at one time.

==See also==
*[[List of DOS commands]]

==References==
{{Reflist}}

==Further reading==
*{{Cite book|author-last=Cooper|author-first=Jim|title=Special Edition Using MS-DOS 6.22, Third Edition|date=2001|publisher=[[Que Publishing]]|isbn=978-0789725738}}

{{DEFAULTSORT:Share (Command)}}
[[Category:External DOS commands]]


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