introduction computer programming

Sigchi4life
Category:
Computer Science
Price: $5 USD

Question description





Write your own version of the chmod command.

Your solution should be able to set each of the bits for the group, owner, and world groups
.
The first argument will be the mode to change the file to and the second argument is the file name.

Usage:  chmod MODE FILE

Invoking the command with improper usage should display an appropriate help message.


Sample run:

Given a file named foo.txt:

sets the permissions to rwx for each group:
./chmod 777 foo.txt 

sets the permissions to rwx for owner, and --- for group and world:  ( -rwx------ )
./chmod 700 foo.txt 


Hint:

Remember, to make an octal literal, precede your integer literal with 0.
Thus, 0777 would be 777 in octal.
You can store ocatls in long integers.

long int mode = 0777;

Stores octal 777 in variable mode.

The chmod function accepts an octal argument.

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