Hi Mike:
I am wrong, (some mistakes were to copy and paste), you are right. This was the
correct code that I wanted to write.
It is not necessary to generate random numbers
if [ ! -e ~/flag* ]; then
touch ~/flag
fi
#Trying to release the lock
sleep 1
mv ~/flag ~/flag.lock 2> /dev/null
while (( $? > 0)); do
mv ~/flag ~/flag.lock 2> /dev/null
done
# do locked stuff here
#Release the lock
mv ~/flag.lock ~/flag 2> /dev/null
mkdir / ln method also fails if malicious person erase with rmdir or rm
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