Berkeley r-commands: Difference between revisions

Revision as of 14:40, 16 October 2018

Revision as of 14:04, 27 January 2019

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Just as the {{code|uptime}} command shows how long a Unix system has been running since the last restart, {{code|ruptime}} requests a status report from all computers on the local network. It then returns the uptime report. If a computer did not respond within the time limit, then ruptime reports that the system is [[Downtime|down]].<ref>{{cite web |url=https://www.systutorials.com/docs/linux/man/1-ruptime/ |title=ruptime (1) - Linux Man Pages |website=SysTutorials |access-date=2018-03-07}}</ref> This information is tracked and stored by the daemon rwhod, which is also used by the rwho command.<ref name="syst_rwhod"/>

== Security ==

Those r-commands which involve user authentication (rcp, rexec, rlogin, and rsh) share several serious security vulnerabilities:

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Due to these problems, the r-commands fell into relative disuse (with many Unix and [[Linux]] distributions no longer including them by default). Many networks that formerly relied on rlogin and telnet have replaced them with [[Secure shell|SSH]] and its rlogin-equivalent ''slogin''.<ref name="Sobell">{{cite book|last=Sobell|first=Mark|title=A Practical Guide to Linux Commands, Editors, and Shell Programming|ISBN=978-0-13-136736-4|date=2010|publisher=Pearson Education, Inc}}</ref><ref name="iu">{{cite web|title=Unix job control command list|publisher=Indiana University|url=https://kb.iu.edu/d/afnw|accessdate=20 December 2014}}</ref>

== See also ==

* [[List of Unix commands]]

==Notes==

{{reflistReflist|30em}}

== References ==

{{refbegin}}

* {{FOLDOC}}

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* {{man|1|rlogin|Solaris|remote login}}

{{unixUnix commands}}

{{unix commands}}

[[Category:Internet protocols]]