While using associative arrays, I run into this little issue using this sample KSH93 code:

#!/bin/ksh93u+

function scmp {
        typeset -A IPAA;

        # Load First File.
        for KEY in $(cat 1.rip); do
                IPA1[KEY]=1;
        done

        # Load Second File.
        for KEY in $(cat 2.rip); do
                IPA2[KEY]=1;
        done
};

function main {
        scmp;
};
main;

Which resulted in this error:

[root@mbpc bin]# ./a.ksh
./a.ksh[23]: main[21]: scmp: line 10: 192.81.0.250: arithmetic syntax error
[root@mbpc bin]#

The real change to address was here and it was to set the IPA1 and IPA2 to associative array type (Had typeset -A IPAA erronously):

#!/bin/ksh93u+

function scmp {
        typeset -A IPA1;           
        typeset -A IPA2;           

        # Load First File.
        (( CNT = 0 ));
        for KEY in $(cat 1.rip); do
                (( CNT++ ));
                IPA1[“${KEY}”]=1;
                print "CNT=|$CNT|";
        done

        # Load Second File.
        for KEY in $(cat 2.rip); do
                IPA2[“”KEY]=1;
        done
};

function main {
        scmp;
};
main;

which naturally fixed the problem.  Of course, the above could be generated for any number of reasons however in this case, it was the typeset lines above:

Cheers,
TK