Very Computer

1. shell script error

I am using Solaris 8 and am writing a shell script using Bourne Shell.

I am learning shell scripting and I have a problem with a shell script
that I wrote below:

# more test3
#!/bin/sh

until [ "$a" -eq "0" ]
do
    print "Enter any number:"
    read num
        if [ $num -ne $a ] then
        echo "not the number"
        else
           break
        fi
done

# ./test3
./test3: syntax error at line 10: `else' unexpected

Can anyone please tell me what is wrong with this shell script?
Also, is it okay to have nested "while..do..done" loops?

Thank you.

Kingsley

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