The obvious, simple thing to do to fix this is to change the line:
ls system_inbound/RSK_* | awk -F'_' 'to:
cd system_inbound && ls RSK_* | awk -F'_' '
Then the awk script is dealing with...
Try:
ls RSK_* | awk -F'_' '
$2 == last2 {
printf("rm -f \"%s\"\n", last0)
}
{ last0 = $0
last2 = $2
}'
If that correctly lists the rm commands you want to run, change the last line of the...