Dirname and basename did not work after linux patch

Friends,
We have a shell script works well before linux (Linux 2.6.32-400.33.2.el5uek x86_64) patch last month.
Based on debug issue in
export PLOC=`dirname $0`
export PDIR=`basename $0`
The testing message as
export PLOC=`dirname $0`
dirname: invalid option -- b
Try `dirname --help' for more information.
How to fix this issue?
Thanks
newdba

The message "invalid option -- 'b'" results from $0 being "-bash". This can be the case if you are source executing the script. This would be a normal behavior.
For instance:
echo "basename \$0" > t1
chmod u+x t1
./t1
t1
. t1
basename: invalid option -- 'b'
Try `basename --help' for more information.

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Dirname and basename did not work after linux patch

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