Table of Contents

hpc0 Keywords

Xenix

Definition

Essentially the first real version of unix that ran on the very first IBM computers back in the 70's. It is claimed to have many similarites to BSD unix and over the years has been rewritten many times.

Shell

Definition

A program that reads and decodes comand line inputs as a program. Essentially a big list of command line inputs that run like any other program.

Demonstration

echo "enter first number: "
read num1
echo "enter second number: "
read num2
echo "enter third number: "
read num3
echo "enter fourth number: "
read num4

sum=`echo $num1+$num2+$num3+$num4 | bc`
echo "The sum of the numbers is: $sum"
product=`echo $num1*$num2*$num3*$num4 | bc`
echo "The product of the numbers is: $product"

process ID (PID)

Definition

This is a sort of a filing system for unix that assigns a specific and permanent number to a process the entire time that process is in mrmory. Very handy if you want to kill the process later as this number gives you direct means of telling the OS what to kill.

Demonstration

ps command displays the processes aslong with their corresponding PIDs

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
jhammo13 12321  0.0  0.1  13688  2064 pts/14   SNs  10:02   0:00 -bash
jhammo13 12615  0.0  0.0   8588   988 pts/14   RN+  10:06   0:00 ps u
jhammo13 13014  0.0  0.0  13660     8 pts/37   SNs  Jan24   0:00 /bin/bash
jhammo13 13018  0.0  0.1  42536  1888 pts/37   SN+  Jan24  12:32 irssi

Swapping

Definition

This is a technique used by Unix's kernel in order to free up memory in times of extreme memory shortages or when a process has idled for a certain period of time.

Priority

Definition

This is a number that forces the Unix kernel to run more efficiently eith processes. The number inidicates to the kernel how often the individual process is used, therefore when the kernel sees a number indicating the process is used very often it targes that process and completes it more quickly than one of low priority.

Flag

Definition

This is a variable set to indicate that some condition in the program has been met.

Demonstration

If a useris chaecking for a certain condition such as the end of a file within a program, when the end of that file is reached the flag will be 'set.'

Centralized Server Farms

Definition

Databases that store a large magnitude of data so that an end user does not have to store it all locally. However, as the client needs large amounts of this data the bottleneck becomes the network.

Power Workgroups

Definition

A set of clients in a LAN that must send and receive large amounts of data in small amounts of time resulting in a need for a faster LAN.

hpc0 Objective

hpc0 Objective

State the course objective

Definition

In your own words, define what that objective entails.

Method

State the method you will use for measuring successful academic/intellectual achievement of this objective.

Measurement

Follow your method and obtain a measurement. Document the results here.

Analysis

Reflect upon your results of the measurement to ascertain your achievement of the particular course objective.