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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 ...
When a file with setuid is executed, the resulting process will assume the effective user ID given to the owner class. This enables users to be treated temporarily as root (or another user). The set group ID, setgid, or SGID permission. When a file with setgid is executed, the resulting process will assume the group ID given to the group class ...
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.
Changes file security context chgrp: Changes file group ownership chown: Changes file ownership chmod: Changes the permissions of a file or directory cp: Copies a file or directory dd: Copies and converts a file df: Shows disk free space on file systems dir: Is exactly like "ls -C -b". (Files are by default listed in columns and sorted vertically.)
Change the file group ownership PWB UNIX chmod: Filesystem ... Create a tags file 3BSD cut: ... Remove unnecessary information from executable files Version 1 AT&T ...
The Unix and Linux access rights flags setuid and setgid (short for set user identity and set group identity) [1] allow users to run an executable with the file system permissions of the executable's owner or group respectively and to change behaviour in directories. They are often used to allow users on a computer system to run programs with ...
Generally, the mask only affects file permissions during the creation of new files and has no effect when file permissions are changed in existing files; however, the chmod command will check the mask when the mode options are specified using symbolic mode and a reference to a class of users is not specified. The mask is stored as a group of bits.
In general, based on a makefile, Make updates target files from source files if any source file has a newer timestamp than the target file or the target file does not exist. For example, this could include compiling C files ( *.c ) into object files , then linking the object files into an executable program.