UNIX is an operating system that originated
at Bell Labs in 1969 as an interactive time-sharing system.
Ken Thompson and Dennis Ritchie are considered the inventors
of UNIX. The name (pronounced YEW-nihks) was a pun based on
an earlier system, Multiplexed Information and Computing Se.
In 1974, UNIX became the first operating system written in
the C language. UNIX has evolved as a kind of large freeware
product, with many extensions and new ideas provided in a
variety of versions of UNIX by different companies, universities,
and individuals. More information can be found at http://whatis.techtarget.com/definition/0,289893,sid9_gci213253,00.html.
- What are some common UNIX
- My workstation "froze." What can I do?
First of all, NEVER REBOOT A UNIX MACHINE/SUN WORKSTATION.
That being said, it is quite an achievement to actually
"freeze" a unix workstation, although the causes
for an unresponsive box can be numerous. Two major reasons
for a freeze, and the means to "defrosting" them
are listed below:
- Excessive Resources Demand: If an application requires
the use of multiple CPUs, threads issues may freeze
or cause the entire Workstation to become unresponsive.
To end the processes that are causing this, you should
telnet into the unresponsive Workstation from another
machine. To telnet into one machine from another the
SIS labs, type "telnet Workstation" (where
Workstation represents the "name" of
the unresponsive Workstation). Log in using your paradox
loginname and password. At the command line, type "ps
This will return a list of all of the processes you
are running on the unresponsive Workstation. Find the
PID (process id circled in the graphic) for the process
- At the command line, type the following to kill (end)
your current session on the unresponsive Workstation:
"kill -9 PID" (where PID represents
the actual process id number, in this case 7420). Almost
immediately, the unresponsive Workstation should return
to the login screen.
- Another User: If it appears that your machine is freezing
up, or running extremely slowly, you may be sharing
your Workstation with a remote user. That user is using
processes that are impairing the system's response time.
If you believe that this is the case, please let the
labs administrator know.
- More unix help files