Thank you very much for all the replies.To be more clear, now i am working on the below line of code to get the output.I am trying to write some if condition here so that SGWa-i is renamed to SGWa-i_LOWCASE and SGWA-I is renamed to SGWA-I_UPCASE.Sample data is provided below,Earlier i provided the data file with values but here i am providing the basic sketch file which is supposed to be referred

Sample data

sgw sketch sgwpts1 format EMS,SGW1,%date%,%time%,%sgw-vpnname%,%sgw-vp
+nid%,%sgw-servname%,%sgw-servid%
sgw sketch sgwptsh format EMS,SGWh,%date%,%time%,%sgw-vpnname%,%sgw-vp
+nid%,%sgw-servname%,%sgw-servid%
sgw sketch sgwptsi format EMS,SGWi,%date%,%time%,%sgw-vpnname%,%sgw-vp
+nid%,%sgw-servname%,%sgw-servid%
sgw sketch, sgwptsH format, EMS,SGWH,%date%,%time%,%sgw-vpnname%,%sgw-
+vpnid%,%sgw-servname%,%sgw-servid%
sgw sketch sgwptsI format EMS,SGWI,%date%,%time%,%sgw-vpnname%,%sgw-vp
+nid%,%sgw-servname%,%sgw-servid%
[download]

Lines of code i am writing

    sub load_sketch {
    my ($sketch_file) = @_;
    my %all_sketches = ();
    open(DAT, $sketch_file) || die("Could not open file $sketch_file!"
+);
    my @lines = <DAT>;
    close(DAT);
    foreach (@lines) {   
        s/[\r\n\s%]+//g;
        my @all_columns = split(',', $_);
        
        $all_sketches{ uc($all_columns[1]).'STAT' } = [ @all_columns ]
+; # Output file will have SGWSTAT in its name
    }
    return %all_sketches;
}
1;    # tells perl that the package is ready to run
[download]

Please help me in the above code on how to rename or please suggest if there are better ways to handle it here

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