In this lab you will learn to write and execute a shell script that includes comments. you will use chmod to make the file that holds the script executable and include a line that starts with #! in the script to make sure bash executes it. this lab also provides an introduction to positional parameters.

reading read "writing and executing a simple shell script" on pages 294–299 of sobell. procedure
1. use vim or cat (see page 20 of this lab manual for instructions) to create a file named short with the following line in it:
echo 'hi there'

2. use cat to verify the contents of short and then try to execute it. use ls –l to display the permissions for short. read the tip on sobell, page 296.

:you areto design the controller for alight that functions both as an ordinary light and also as a motion activated light and alarm. a.if the manual switch s is on, then the light l is on. b.besides the manual switch, there is a motion detector, m1, which activatesthis light.c.if motion is detected but the light is on anyway because s is on, only then a secondoutput a, an alarm, is turned on. d.the disable switch, d, disables the motion activated light and alarmbut leaves manual control operation of the light using switch s.(i)read the problem statement and clearly identify the inputs and outputs for the circuit you are designing. (ii)create the truth table for this system; include the light, alarm, switch, disable, and the motion sensor.(iii)draw a schematic of this system.