5-2-Variables.md

5.2 Variables

5.2.2 Exercises

1. Write a Bash program where you assign two numbers to different variables, and then the program prints the sum of those variables.

   #!usr/bin/env bash
   # File: ex5-2-q1.sh
   
   var_x=3
   
   var_y=4
   
   let var_sum=$var_x+$var_y 
   # or var_sum=$(expr $var_x + $var_y)
   
   echo "$var_x + $var_y = $var_sum"

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2. Write another Bash program where you assign two strings to different variables, and then the program prints both of those strings. Write a version where the strings are printed on the same line, and a version where the strings are printed on different lines.

   #!usr/bin/env bash
   # File: ex5-2-q2.sh
   
   str_x="Unix"
   
   str_y="Workbench"
   
   echo "Version 1: $str_x $str_y"
   
   echo -e "Version 2:\n$str_x\n$str_y"

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3. Write a Bash program that prints the number of arguments provided to that program multiplied by the first argument provided to the program.

   #!usr/bin/env bash
   # File: ex5-2-q3.sh
   
   let var_res=$1*$#
   # or var_res=$(expr $1 \* $#)
   
   echo "Result = $var_res"