Question
How do you change File Access Permissions?
Answers
Every file has following attributes:
? owner's user ID ( 16 bit integer )
? owner's group ID ( 16 bit integer )
? File access mode word
'r w x - r w x - r w x'
(user permission - group permission - others permission)
r-read, w-write, x-execute.

To change the access mode, we use chmod(filename,mode).
Example 1:
To change mode of myfile to 'rw-rw-r--' (ie. read, write permission for user - read,write permission for group - only read permission for others) we give the args as:
chmod(myfile,0664) .
Each operation is represented by discrete values
'r' is 4
'w' is 2
'x' is 1
Therefore, for 'rw' the value is 6(4+2).
Example 2:
To change mode of myfile to 'rwxr--r--' we give the args as:
chmod(myfile,0744).   Your Comment




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