Java™ Application Development on Linux - Dator

20.3 Be an Enabler, or “Let’s Be Codependent!”449NOTEWe are assuming you are carrying out these steps in sequence and thus yourcurrent working directory is still /usr/local.4. Set directory permissions on /usr/local.You want slightly different permissions on directories. First, you wantthe group to have execute permission on directories. This allows eachmember of the group to make each directory his or her current workingdirectory. See Eric Raymond’s Unix and Internet Fundamentals 6 for a goodbasic introduction to file permissions on UNIX.Also, on Linux systems, when a user creates a file, that file is, by default,group-owned by the user’s primary group, 7 which is not what wewant here. We want files created by a user in this directory to be groupownedby the local group. To do this, we have to set the setgid bit on allthe directories in /usr/local and below. When a user creates a file in adirectory that has the setgid bit set, that file will be group-owned by thegroup-owner of the directory if the user is a member of that group. If theuser is not, it will be group-owned by the user’s default group as usual. Sowe need to set execute and setgid permissions on all the directories in/usr/local and below:# find /usr/local -type d -exec chmod g+xs {} \; -print/usr/local/usr/local/share/usr/local/share/bochs/usr/local/share/bochs/keymaps/usr/local/share/bochs/keymaps/CVS/usr/local/share/doc......etc.6. http://en.tldp.org/HOWTO/Unix-and-Internet-Fundamentals-HOWTO/disk-layout.html#permissions7. Which is the group ID specified for the user in the /etc/passwd file.