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How to find the last argument in a argument line?

Thx..
Can you give example ?

.sh shell

Thanks for the response.
Can you please demonstrate for the above requirement? A request!
Please make a not that "-" may appear anywhere in the string.
We need to find if it contains "-"
Thanks.

I am passing a string as argument. Need to check if it contains "-".
If it contains "-" then check if it contains "-r" .If Yes then print some message else check if it contains "-t".If yes print...

Check if records of table B are 1 month old. if yes then Truncate table B_SNAPSHOT and then copy data from B to SNAPSHOT_B table otherwise no need to copy.
Run a schedular after every 15 minutes.
...

if [ $1 -eq -* ]
then
if [ $1 = -t ]
then
echo "fst argument is $1 "
else
if [ $1 = -r ]
then
"fst argument is $1"
fi
...