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dr-x-----: a directory whose user class has read and execute permissions and whose group and others classes have no permissions. In some permission systems additional symbols in the ls -l display represent additional permission features: + (plus) suffix indicates an access control list that can control additional permissions.
The file owner is 'root' and the SUID permission is set (the '4') - so the file is executed as 'root'. The reason an executable would be run as 'root' is so that it can modify specific files that the user would not normally be allowed to, without giving the user full root access. A default use of this can be seen with the /usr/bin/passwd binary ...
Sets read and write permission for user, sets read for Group, and denies access for Others: chmod -R u+w,go-w docs: Adds write permission to the directory docs and all its contents (i.e. Recursively) for owner, and removes write permission for group and others chmod ug=rw groupAgreements.txt: Sets read and write permissions for user and Group
Sudo command on Ubuntu to temporarily assume root privileges. Most Unix and Unix-like systems have an account or group which enables a user to exact complete control over the system, often known as a root account. If access to this account is gained by an unwanted user, this results in a complete breach of the system.
The name root may have originated because root is the only user account with permission to modify the root directory of a Unix system. This directory was originally considered to be root's home directory, [4] but the UNIX Filesystem Hierarchy Standard now recommends that root's home be at /root. [5]
It may be root's user ID only if ruid, suid, or euid is root. Whenever the euid is changed, the change is propagated to the fsuid. The intent of fsuid is to permit programs (e.g., the NFS server) to limit themselves to the file system rights of some given uid without giving that uid permission to send them signals.
For directories, when a directory's sticky bit is set, the filesystem treats the files in such directories in a special way so only the file's owner, the directory's owner, or root user can rename or delete the file. Without the sticky bit set, any user with write and execute permissions for the directory can rename or delete contained files ...
Directory Description / Primary hierarchy root and root directory of the entire file system hierarchy. /bin: Essential command binaries that need to be available in single-user mode, including to bring up the system or repair it, [3] for all users (e.g., cat, ls, cp). /boot: Boot loader files (e.g., kernels, initrd). /dev