Red Hat System Administration I
File ownership permissions have three categories. A file is owned by a user, a single group, and other users. The most specific permission applies. User permissions override group permissions, and group permissions override other permissions.
The
lscommand-loption expands the file listing to include both the file permissions and ownership.The
chmodcommand changes file permissions from the command line.The
chmodcommand can use one of two methods to represent permissions: symbolic or octal.The
chowncommand changes file ownership. Thechowncommand-Roption recursively changes the ownership of a directory tree.The
umaskcommand without arguments displays the current umask value of the shell. Every process on the system has a umask.The default umask values for Bash are defined in the
/etc/login.defsfile and might be affected by settings in the/etc/profileand/etc/bashrcfiles, files in/etc/profile.d, or your account's shell initialization files.The
suid,sgid, andstickyspecial permissions provide additional access-related features to files.
