If you want the hashbang to be respected, you need to write your code to a file, make the file executable and then run it.

Most likely, it will be far easier to just launch the file specified in the hashbang and pass it the command(s) on the command line, most likely with the -c switch:

my $shell= '/usr/bin/ksh93';
my $command= <<SHELL;

typeset -A SIZE_MIN

SIZE_MIN=([/var]=2097152
          [/tmp]=1048576
          [/home]=1048576)
ISHACMP=$(lslpp -Lqc cluster.*.server.rte 2>/dev/null | grep -c cluste
+r)

for fs in ${!SIZE_MIN[*]}; do
    fssize=$(df -k $fs | grep -v Filesystem | awk \'{print $2}\')
    if (( $fssize < ${SIZE_MIN[$fs]} )); then
        print "BAD;$fs is less than minimum size ($SIZE_MIN[$fs]}), in
+crease to minimum size"
    elif (( $fssize == ${SIZE_MIN[$fs]} )); then
        print "GOOD;$fs is at minimum size (${SIZE_MIN[$fs]} kb)"
    else
        print "GOOD;$fs is greater ($fssize) than minimum (${SIZE_MIN[
+$fs]})"
    fi
done
SHELL

my @results= qx($shell -c '$command');
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