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This script will be executed bu other people. Before the script executes, it should be able to check if the currently logged in user has root privileges or not. I want to be able to perform this check through the script.
Many times you will need to change the file permissions. Perhaps to give someone else access to execute a file. To do this you need to use the "chmod" command. There are really two ways to chmod a file... one involves letters, +'s, and -'s which I think is way to confusing. The other way, (explained here) uses numbers. We assign each type of permission (r, w, and x) different numeric values.
r = 4
w = 2
x = 1
But you can use letters:
chmod u+rwx, g+r, o+r somefile