Editing Ptx (Unix)

{{Short description|Computer program that produces concordances}}
{{Refimprove|date=September 2018}}
{{Lowercase|title=ptx}}
{{Infobox software
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| operating system       = [[Unix]] and [[Unix-like]]
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| genre                  = [[Command (computing)|Command]]
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'''ptx''' is a [[Unix utility]], named after the ''[[permuted index]]'' algorithm which it uses to produce a  search or concordance  report in the [[Keyword in Context]] (KWIC) format. It is available on most Unix and Unix-like operating systems (e.g. [[Linux]], [[FreeBSD]]). The [[GNU]] implementation<ref>[https://www.gnu.org/software/coreutils/manual/html_node/ptx-invocation.html#ptx-invocation At www.gnu.org - The GNU Info entry for PTX using Gnu extensions]</ref> uses extensions that are more powerful than the older [[SysV]] implementation.
The command is available as a separate package for [[Microsoft Windows]] as part of the [[UnxUtils]] collection of [[Native (computing)|native]] [[Windows API|Win32]] [[porting|ports]] of common GNU Unix-like utilities.<ref>{{Cite web|url=http://unxutils.sourceforge.net/|title=Native Win32 ports of some GNU utilities|website=unxutils.sourceforge.net}}</ref>

There is also a  corresponding [[IBM mainframe]] utility which performs the same function. Permuted indexes are often used in such places as bibliographic or medical databases, documentation, [[thesaurus|thesauri]], or web sites to aid in locating entries of interest.

==See also==
* [[Concordancer]]

==References==
{{Reflist}}

{{Core Utilities commands}}

[[Category:Information retrieval systems]]
[[Category:Unix text processing utilities]]

{{Unix-stub}}