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In Unix and Unix-like operating systems, chmod is the command and system call used to change the access permissions and the special mode flags ... For example, 754 ...
This is a list of commands from the GNU Core Utilities for Unix environments. These commands can be found on Unix operating systems and most Unix-like operating systems. GNU Core Utilities include basic file, shell and text manipulation utilities. Coreutils includes all of the basic command-line tools that are expected in a POSIX system.
For example, to add the bit on the directory /usr/local/tmp, one would type chmod +t /usr/local/tmp. Or, to make sure that directory has standard tmp permissions, one could also type chmod 1777 /usr/local/tmp. To clear it, use chmod -t /usr/local/tmp or chmod 0777 /usr/local/tmp (the latter will also reset the tmp directory to standard ...
The setuid and setgid bits are normally represented as the values 4 for setuid and 2 for setgid in the high-order octal digit of the file mode. For example, 6711 has both the setuid and setgid bits (4 + 2 = 6) set, and also the file read/write/executable for the owner (7), and executable by the group (first 1) and others (second 1).
The following are some examples of symbolic notation: -rwxr-xr-x : a regular file whose user class has full permissions and whose group and others classes have only the read and execute permissions. crw-rw-r-- : a character special file whose user and group classes have the read and write permissions and whose others class has only the read ...
"Experienced Unix and Linux users tend to recommend that the user of this command check the man page (man chmod) on the system of interest." Change to something like Users of old versions of Unix should check the man page. (with footnote references to old man pages). Or just delete the sentence.
chattr — Change file attributes on a Linux file system. chgrp — Change group of one or more files. chmod — Change mode of listed files. chown — Change owner of one or more files. chroot — Run command within a new root directory. chrt — Get/set a process' real-time scheduling policy and priority. chsh — Change your login shell.
The mask is generally only applied to functions that create a new file; however, there are exceptions. For example, when using UNIX and GNU versions of chmod to set the permissions of a file, and symbolic notation is used, and no user is specified, then the mask is applied to the requested permissions before they are applied to the file. For ...