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A chmod command first appeared in AT&T Unix version 1, along with the chmod system call. As systems grew in number and types of users, access-control lists [3] were added to many file systems in addition to these most basic modes to increase flexibility. The version of chmod bundled in GNU coreutils was written by David MacKenzie and Jim ...
Files and directories are assigned a group, which define the file's group class. Distinct permissions apply to members of the file's group. The owner may be a member of the file's group. Users who are not the owner, nor a member of the group, comprise a file's others class. Distinct permissions apply to others.
tree is a command-line utility that recursively lists files found in a directory tree, indenting the filenames according to their position in the file hierarchy. GNU Find Utilities (also known as findutils) is a GNU package which contains implementations of the tools find and xargs .
Any user may create a sticky directory. See chmod(1) for details about modifying file modes. Historically, an executable shareable file which had the sticky bit set was not immediately discarded from swap space after execution. The kernel hoarded the text segment of the file for future reuse, thus avoiding having to reload the program.
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 ...
Unix systems are characterized by various concepts: the use of plain text for storing data; a hierarchical file system; treating devices and certain types of inter-process communication (IPC) as files; and the use of a large number of software tools, small programs that can be strung together through a command-line interpreter using pipes, as ...
Plan 9's union directory architecture inspired 4.4BSD and Linux union file system implementations, [45] although the developers of the BSD union mounting facility found the non-recursive merging of directories in Plan 9 "too restrictive for general purpose use".
Davidson was the first "hunter" in Dream’s Minecraft Manhunt series and has been featured in every episode of the series since. [11] In 2020, Davidson released a video where Dream challenged him to play Minecraft while wearing a shock collar around his arm, which would painfully shock Davidson if he took damage in the game. [12]