Assignment #1

Due Midnight, Wednesday Sept. 17, 1997

Implement the following utility using either the Bourne "sh" or Berkeley "csh"

NAME

pchmod - change the permissions mode of a path

SYNOPSIS

pchmod args

DESCRIPTION

The args of pchmod are identical to the args of chmod(1) with the following restriction: the object files specified in args should EXIST and does NOT contain any "/". pchmod give an error message and exits if any of the object files contains "/". pchmod makes sure that all directories leading to the object files are world executable.

Example 1:

% cd /home/cs476/.Fall95/submissions/assign4
% pchmod -R a+rx fraser.0

The program will in-effect do the following:
% chmod o+x /home
chmod: WARNING: can't change /home
% chmod o+x /home/cs476
% chmod o+x /home/cs476/.Fall95
% chmod o+x /home/cs476/.Fall95/submissions
% chmod o+x /home/cs476/.Fall95/submissions/assign4
% chmod -R a+rx fraser.0
%

Note that your program should ignore all errors/warning generated from using chmod(1).

Example 2:

% pchmod -R a+rx frser.0
pchmod: ERROR: frser.0 does not exist
%

Example 3:

% pchmod a+r /home/cs476
pchmod: ERROR: do not use "/" in args
%