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Frequently Asked Questions

Why did you choose this name? How does Sh relate to the Unix shell "sh"?

Frequently Asked Questions - ShWiki
Sh originated from a larger research project called SMASH, which involved exploring not only software programmability of GPUs, but also hardware features. Sh was to form the software layer of the SMASH system. Eventually it was discovered that the name SMASH was already in use by a related project, so the two main parts were split into Sm (for the simulator) and Sh (for the language), conveniently making SMASH an acronym for "Sm and Sh".
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Why is /bin/sh so minimal? Why does FreeBSD not use bash or another shell?

Frequently Asked Questions for FreeBSD 2.X, 3.X, 4.X, 5.X, a...
The more complicated answer: many people need to write shell scripts which will be portable across many systems. That is why POSIX specifies the shell and utility commands in great detail. Most scripts are written in Bourne shell, and because several important programming interfaces (make(1), system(3), popen(3), and analogues in higher-level scripting languages like Perl and Tcl) are specified to use the Bourne shell to interpret commands.
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How can you tell what shell you are running on UNIX system?

Tech Interviews.com
Dr. Dobb’s Journal in its Linux and open source section is running an article by Emmett Dulaney with 50 Perl questions and answers. The focus is mainly on the knowledge of the language itself with questions like:
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Why is /bin/sh so minimal? Why doesn't FreeBSD use bash or another shell?

Frequently Asked Questions for FreeBSD 2.X, 3.X and 4.X
The more complicated answer: many people need to write shell scripts which will be portable across many systems. That is why POSIX specifies the shell and utility commands in great detail. Most scripts are written in Bourne shell, and because several important programming interfaces ( make(1), system(3), popen(3), and analogues in higher-level scripting languages like Perl and Tcl) are specified to use the Bourne shell to interpret commands.
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What is UNIX Shell Access?

Hosting Frequently Asked Questions
Unix is the operating system of our server. Shell Access allows you to telnet in and use various programs already installed there. Some examples are PINE (an easy to use e-mail client), LYNX (web browser), PICO (a text editor), MAIL (a primitive e-mail client), IRC (Internet Relay Chat) and networking tools like NSLOOKUP, WHOIS, FINGER, RWHOIS.
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Can I use the UNIX shell?

Seattle Community Network: FAQ, Personal Web Sites
No, generally speaking. But if you can contribute something useful as a volunteer that requires shell access to do it, please ask.
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Can I have a Unix shell account?

IDS - Support
If you want your PHP scripts to be able to write to files in your home directory, you will need to use ACLs (Access Control Lists) to modify your file permissions. If you have a UNIX shell account on the IDS server, you can do this yourself using the setfacl command. See the ACL Howto in the support section of the site for details on setting ACLs. If you don't have a UNIX shell account, then you can send an email to IDS Administration with a request to change the ACLs on your files.
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How do I change the UNIX shell ?

Help Desk | FAQ's about Shell Access
shell [10] chsh Changing the login shell for username Enter the new value, or press return for the default Login Shell [/bin/bash]: Replace /bin/bash with the UNIX shell you would like to use.
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What will happen to my UNIX shell account?

ZipSpace Online Personal Storage - FAQ
Check your current disk space usage; you may be over your quota (See #2 above on how to check your current disk space usage) If you continue to have problems; please contact the support desk at (330) 972-6888 or consult@uakron.edu
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What UNIX workstations does it run on ?

GMT - Frequently Asked GMT Questions
GMT has been installed on a variety of UNIX systems, including (but not limited to) computers from Cray, Sun, IBM, DEC, HP, SGI, Data General, Apple (Mac OS X), and Next, all running some flavor of UNIX. GMT has also been installed under Linux and MkLinux, which are open source UNIX-like operating systems for PC and Mac OS 9, respectively. GMT also installs under Windows and OS/2. GMT is very portable and should compile on almost any computer.
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How does depression relate to PMDD?

facts for health--premenstual dysphoric disorder--frequently...
Depression is one of the more common symptoms of PMDD. Women often feel sad, blue, unhappy, down in the dumps, and/or hopeless as part of the PMDD symptom complex. But remember, the depressive symptoms of PMDD are linked to the menstrual cycle and must be absent at least during the week following menses. Also, depression is not necessary for the diagnosis of PMDD.
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How does RL relate to Neuroscience?

RL FAQ
Ideally, the ideas of reinforcement learning could constitute part of a computational theory of what the brain is doing and why. A number of links have been drawn between reinforcement learning and neuroscience, beginning with early models of classical conditioning based on temporal-difference learning (see Barto and Sutton, 1982; Sutton and Barto, 1981, 1990; Moore et al., 1986), and continuing through work on foraging and prediction learning (see Montague et al.
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How does RL relate to behaviorism?

RL FAQ
Formally, RL is unrelated to behaviorism, or at least to the aspects of behaviorism that are widely viewed as undesireable. Behaviorism has been disparaged for focusing exclusively on behavior, refusing to consider what was going on inside the head of the subject. RL of course is all about the algorithms and processes going on inside the agent. For example, we often consider the construction of internal models of the environment within the agent, which is far outside the scope of behaviorism.
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How does melatonin relate to my health?

GDX Comprehensive Melatonin Profile Frequently Asked Questio...
Melatonin levels decrease with age and this deficit may play an important role in the high frequency of insomnia among elderly people. A disruption in the normal sleep-wake cycle caused by shift work, jet lag, stress, or other factors can also trigger abnormal levels. Low levels of melatonin have been linked to depression and many degenerative diseases, such as AIDS and cancer. Melatonin also has the potential to modify ovarian function.
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How does percolation relate to SOC ?

Self-Organizing Systems FAQ for Usenet newsgroup comp.theory...
Percolation is an arrangement of parts (usually visualised as a matrix) such that a property can arise that connects the opposite sides of the structure. This can be regarded as making a path in a disconnected matrix or making an obstruction in a fully connected one. The boundary at which the system goes from disconnected to connected is a sudden one, a step or phase change in the properties of the system.
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How does it relate to chaos ?

Self-Organizing Systems FAQ for Usenet newsgroup comp.theory...
In nonlinear studies we find much structure for very simple systems, as seen in the self-similar structure of fractals and the bifurcation structure seen in the logistic map. This form of system exhibits complex behaviour from simple rules. In contrast, for self-organizing systems we have complex assemblies generating simple emergent behaviour, so in essence the two concepts are complementary.
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How does the DOI System relate to DNS?

Frequently Asked Questions
The most common mechanism for resolution on the Internet is the Domain Name System (DNS): http as used in URL is a use of DNS. URLs are grouped by domain name and then by some hierarchical structure, originally based on file trees, now possibly unconnected from that but still a hierarchy. DOI names offer a more finely grained approach to naming where each name stands on its own, unconnected to any DNS or other hierarchy.
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How does the immune system relate to inflammation?

Inflammation 101: Frequently Asked Questions
Many of the cells and molecules that carry out inflammation belong to the immune system, which consists of a brigade of specialized cells, tissues, and natural chemical substances that continually protect the body from harm.
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What is Java and how does it relate to the Internet?

CAPP 385: World Wide Web
Java is a programming language and a full development environment. Java allows the development of applications (applets) that can run on a variety of platforms (Microsoft is pushing ActiveX as an alternative). Java is ideal for Internet client/server applications. I would suddenly come across a dialog box telling "Illegal operation Performed. CLOSE,DEBUG DETAILS."I once chose Close and I had to logon to the Internet all over again.
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Why did only 15 s.h. of credit transfer in instead of the full 21 s.h. I have completed?

Methodist University - Academic Services FAQs
There are various reasons why courses do not transfer from institution to institution. If you think there is a course which should have been accepted by Methodist University based on the course descriptions from here and your previous institution, simply schedule an appointment with the Registrar at 1-800-488-7110 extension 7318, (910) 630-7318. Please be aware that the course description should read the same in order to warrant a meeting.
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Which shell should I use under Unix?

Network Engineering Technology Frequently Asked Questions (F...
First, this is a religious issue if there ever was one, for Unix users. The most popular shells (in no particular order) are the Bourne shell (sh), the Korn shell (ksh), the C shell (csh), the T shell tcsh. There are certainly are intelligent folks that use, and are proponents of, each shell out there. The Korn shell is available with nearly every Unix. It was written by David Korn of AT&T Bell Labs and has been provided with all System V-derived Unix systems since at least the late '80s.
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Why does zsh not work in an Emacs shell mode any more?

Z-Shell Frequently-Asked Questions
Emacs 19.29 or thereabouts stopped using a terminal type of "emacs" in shell buffers, and instead sets it to "dumb". Zsh only kicks in its special I'm-inside-emacs initialization when the terminal type is "emacs". Probably the most reliable way of dealing with this is to look for the environment variable $EMACS, which is set to t in Emacs' shell mode. Putting [[ $EMACS = t ]] && unsetopt zle in your .zshrc should be sufficient.
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Why choose one of your rowing craft over the typical racing shell?

Easy Rider's Frequently Asked Questions (F.A.Q.)
Because of stability and seaworthiness. In contrast to our recreational rowing craft, university-type rowing shells are very nimble and not really seaworthy. Most Easy Rider customers are interested in rowing for fitness and relaxation. They want a stable boat which does not require constant attention (to stay upright). Our customers can concentrate on the beauty of their surroundings, can relax the body, calm the mind, and relieve everyday tensions.
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How does this relate to Parkinson's?

Parkinson's Disease Society - FAQs compulsive behaviours
There are several categories of drugs for the treatment of Parkinson's, and it is thought that there may be a connection between some dopamine agonists (one class of drugs that can be used to treat Parkinson's) and the incidence of compulsive behaviour. However, clinical studies have shown this to be an uncommon side effect currently estimated to occur in up to 14% of people taking dopamine agonists.
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How does it relate to gasoline or diesel storage?

Hydrogen Now! Frequently Asked Questions
Hydrogen has more energy per weight, but less energy per volume than any other fuel. One kilogram of hydrogen has approximately the same amount of energy as one gallon of gasoline. Hydrogen is ideal for use in jet airplanes because it is so light. Jet airplanes that use hydrogen require larger fuel tanks, but, because hydrogen is so light, the wings can be smaller, the engines less powerful and the number of passengers can be increased.
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How does RL relate to Neuro-Dynamic Programming?

RL FAQ
To a first approximation, Reinforcement Learning and Neuro-Dynamic Programming are synonomous. The name "reinforcement learning" came from psychology (although psychologists rarely use exactly this term) and dates back to the eary days of cybernetics. For example, Marvin Minsky used this term in his 1954 thesis, and Barto and Sutton revived it in the early 1980's.
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How does RL relate to the psychology of animal behavior?

RL FAQ
Broadly speaking, RL works as a pretty good model of instrumental learning, though a detailed argument for this has never been publically made (the closest to this is probably Barto, Sutton and Watkins, 1990). On the other hand, the links between classical (or Pavlovian) conditioning and temporal-difference (TD) learning (one of the central elements of RL) are close and widely acknowledged (see Sutton and Barto, 1990).
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How does RL relate to genetic algorithms?

RL FAQ
Most work with genetic algorithms simulates evolution, not learning during an individual's life, and because of this is very different from work in RL. That having been said, there are two provisos. First, there is a large body of work on classifier systems that uses or is closely related to genetic algorithms. This work is concerned with learning during a single agent's lifetime (using GAs to organize the components of the agent's mind) and is in fact RL research.
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What is a musculoskeletal disorder? How does it relate to work?

Frequently Asked Questions
Musculoskeletal disorders (also called MSD’s, RSI’s or MSI’s) include a group of conditions involving nerves, tendons, muscles, and supporting structures. MSD’s can vary in severity from mild periodic symptoms to severe chronic and debilitating conditions. Examples include: Carpal Tunnel Syndrome, tendinitis, tension neck syndrome, and low back pain. Symptoms may include pain, numbness, and tingling.
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