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Re: Setting group ID
You can also use the chown function.
From "UNIX for Programmers and Users" by Graham Glass, P 401:
int chown(char * FileName, int ownerId, int groupId);
int fchown (int fd, int ownerId, int groupId);
Putting a -1 in for ownerId or groupId makes them remain unchanged.
Here is an example from the book:
flag=chown("test.txt", -1, 62);
if (flag == -1) perror ("chown.c");
This sets the groupId of the test.txt file to 62. If the file is already
open and you have a file descriptor for it, then you can use the fchown()
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