-o = “OR”

&& = command on right is executed only if command on left executes successfully.

-a = “AND”

|| = command on right is executed only if command on left did NOT execute successfully.

! = “NOT”

-lt = less than

-gt = greater than

-eq = equals

!= - not equal to

-f A = is a file that exists.

#!/bin/bash

echo -e “What is your favorite color? :”   
read REPLY

          if [ “$REPLY” = “red”  –o  “$REPLY” = “blue” ]
          then
                    echo “The answer is red or blue.”
          else  
                    echo “The answer is not red nor blue.”
          fi
 

#!/bin/bash

echo ' Do you wish to add a contact to the address book? '
read choice1

if [ $choice1 = “y” –o $choice1 = “Y” ]
then
        echo ' Please enter the contact name: '
        read contactName

        echo ' Please enter the contact company or organization: '
        read contactCompany

        echo ' Please enter the contact telephone number: '
        read contactPhone

        echo ' Please enter the contact street address: '
        read contactStreet

        echo ' Please enter the contact state and zip code: '
        read contactZip

        # Now write the contents to a file via redirection.  Below should all be on same line.
        # Note that you need to also have created an empty text file called "ContactDatabase".
        # You could use the "touch" command for this.

        echo -e “Name: $contactName   Company: $contactCompany   Phone: $contactPhone  Street:  
        $contactStreet   Zip: $contactZip” >> ContactDatabase

fi

echo ' Would you like to search for an entry in the contact database? '
read choice2

if [ $choice2 = “y” –o $choice2 = “Y” ]
then
              echo ' What word do you wish to search for? '
              read searchItem

              grep $searchItem ContactDatabase

elif [ $choice2 = “n” –o $choice2 = “N” ]
then
             echo ' O.k., I guess not. '

else
            echo ' That was not an option. '

fi
 

#!/bin/bash

#Below we assign a variable to be used as a sentinel value.
loopit="y"
AreYouSure="n"

while [ $AreYouSure = "n" ]
do

     echo
     echo "What would you like to do now?

     (a) Add a contact entry
     (s) Search for a contact entry
     (x) Exit "

     read menuChoice1

     case $menuChoice1 in

     a | A )

            #Example of a do/while loop. Executes all code between "do" and "done" till falls out.
            while [ $loopit = "y" ]
            do

            echo ' Please enter the contact name: '
            read contactName

            echo ' Please enter the contact company or organization: '
            read contactCompany

            echo ' Please enter the contact telephone number: '
            read contactPhone

            echo ' Please enter the contact street address: '
            read contactStreet

            echo ' Please enter the contact state and zip code: '
            read contactZip

            #Now write the contents to a file via redirection. Need to have created file.
            echo -e Name: $contactName Company: $contactCompany Phone: $contactPhone Street:   
$contactStreet Zip: $contactZip >> ContactDatabase

             echo '\n\n'
             echo 'Would you like to enter another? (y/n)'
             read loopit
             done
             ;;

     s | S )
             echo ' What word do you wish to search for? '
             read searchItem

             grep $searchItem ContactDatabase
             ;;

     x | X )
             echo ' You have chosen to exit. Bye bye. '
             AreYouSure="y"
             exit
             ;;

     * )
             echo ' For shame, that was an invalid response on your part! '


     esac

done

©2005 C. Germany