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In [[computing]], '''<code>tree</code>''' is a recursive [[directory (computing)|directory]] listing [[command (computing)|command]] or [[Computer program|program]] that produces a depth-indented listing of files. Originating in PC- and MS-[[DOS]], it is found in [[Digital Research]] [[FlexOS]],<ref>{{cite book|url=http://www.bitsavers.org/pdf/digitalResearch/flexos/1073-2003_FlexOS_Users_Guide_V1.3_Nov86.pdf|title=FlexOS User's Guide|edition=Version 1.3|date=November 1986|publisher=[[Digital Research]]|id=1073-2003-001|access-date=2018-09-16|archive-date=2019-09-25|archive-url=https://web.archive.org/web/20190925131719/http://bitsavers.org/pdf/digitalResearch/flexos/1073-2003_FlexOS_Users_Guide_V1.3_Nov86.pdf|url-status=dead}}</ref> [[IBM]]/[[Toshiba]] [[4690 Operating System|4690 OS]],<ref>https://archive.org/details/4690OSV6r2UsersGuide/page/n169 {{Dead link|date=March 2020}}</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> [[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 group -- FreeDOS Base|work=FreeDOS on ibiblio.org}}</ref> IBM [[OS/2]],<ref>{{cite web|url=http://www.jatomes.com/Help/Os2Cmd.php#TREE|title=JaTomes Help - OS/2 Commands|access-date=2019-07-27|archive-date=2019-04-14|archive-url=https://web.archive.org/web/20190414130029/http://www.jatomes.com/Help/Os2Cmd.php#TREE|url-status=dead}}</ref> [[Microsoft Windows]],<ref>{{cite web|url=https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/tree|title=Tree|website=Microsoft Docs|date=3 February 2023 }}</ref> and [[ReactOS]]. A version for [[Unix]] and [[Unix-like]] systems is also available.
The <code>tree</code> command is frequently used as part of a [[technical support scam]], where the command is used to occupy the command prompt screen, while the scammer, pretending to be technical support, types additional text that is supposed to look like output of the command.<ref>{{Cite web|url=https://www.tripwire.com/state-of-security/featured/the-world-of-the-technical-support-scam/|title=The World of the Technical Support Scam|date=2016-11-09|website=The State of Security|language=en-US|access-date=2019-12-29}}</ref>
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