Scripting

Question 1

What should the first line of the script file contain

Answer 1

#!/bin/bash - bourne again shell
a path to the shell that will be used to execute the script
#!/bin/sh - bourne shell

Question 2

how to check for conditional logic within a script

Answer 2

if [ a = b ] 
then
  #do something
else
  #do something else
fi

Question 3

how to pass args to a script

Answer 3

./scriptFile.sh arg1 arg2

……………
scriptFile.sh contents
#!/bin/bash

echo here is the value of the first arg: $1
echo here is the value of the second arg: $2

Question 4

how to stop a script execution

Answer 4

exit

remember scripts can have an exit or return value that is a numeric type from 1 to 255. This is useful for passing error values to the calling process. Usually a success will return 0.

Question 5

how to create and use variables

Answer 5

pi=”pig”
echo $pi is my fav animal

#can also use 
let pi="pig"

#spaces are a big no-no
pi = "pig" is invalid

Question 6

is this valid for a variable declaration/assignment

variable = “New Variable”

Answer 6

It is not valid. The spaces will cause the line to error.
It should be:
variable=”New Variable”