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Learn Perl!
It's the only shell language you have to learn.
You can do "anything" with it!

My remarks was about your first message:

d=`df -k |awk '{print $5}' | egrep "[5-9][0-9]" | cut -c-2`
if [ "$d" == "50" ]
then
echo "DISK SPACE STATUS :NOT OK" >>...

There are at least two errors with your script.

1. The if-line compares with exactly 50. But if your disk is 51%, it will not discover that.

2. Your df-command line will display several lines,...