02-Lab-Conditional-Logic.md

Lab Conditional Logic

• Take me to the Lab

1. See the solution

   mission_name=$1
   
   mkdir $mission_name
   
   rocket-add $mission_name
   
   rocket-start-power $mission_name
   rocket-internal-power $mission_name
   rocket-start-sequence $mission_name
   rocket-start-engine $mission_name
   rocket-lift-off $mission_name
   
   rocket_status=$(rocket-status $mission_name)
   
   echo "The status of launch is $rocket_status"
   
   if [ $rocket_status = "failed" ]
   then
     rocket-debug $mission_name
   fi     
   

2. See the solution

   if [ -d "/home/bob/caleston" ]
   then
     echo "Directory exists"
   else
     echo "Directory not found"
   fi
   

3. See the solution

   if [ $1 -gt $2 ]
   then
       echo $1
   else
       echo $2
   fi
   

4. See the solution

   month_number=$1
   
   if [ -z $month_number ]
   then
     echo "No month number given. Please enter a month number as a command line argument."
     echo "eg: ./print-month-number 5"
     exit
   fi
   
   if [[ $month_number -lt 1 && $month_number -gt 12 ]]
   then
     echo "Invalid month number given. Please enter a valid number - 1 to 12."
     exit
   fi
   
   if [ $month_number -eq 1 ]
   then
     echo "January"
   elif [ $month_number -eq 2 ]
   then
     echo "February"
   elif [ $month_number -eq 3 ]
   then
     echo "March"
   elif [ $month_number -eq 4 ]
   then
     echo "April"
   elif [ $month_number -eq 5 ]
   then
     echo "May"
   elif [ $month_number -eq 6 ]
   then
     echo "June"
   elif [ $month_number -eq 7 ]
   then
     echo "July"
   elif [ $month_number -eq 8 ]
   then
     echo "August"
   elif [ $month_number -eq 9 ]
   then
     echo "September"
   elif [ $month_number -eq 10 ]
   then
     echo "October"
   elif [ $month_number -eq 11 ]
   then
     echo "November"
   elif [ $month_number -eq 12 ]
   then
     echo "December"
   fi