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  2. File-system permissions - Wikipedia

    en.wikipedia.org/wiki/File-system_permissions

    The execute permission grants the ability to execute a file. This permission must be set for executable programs, in order to allow the operating system to run them. When set for a directory, the execute permission is interpreted as the search permission: it grants the ability to access file contents and meta-information if its name is known ...

  3. chmod - Wikipedia

    en.wikipedia.org/wiki/Chmod

    sets read, write, and execute permissions for user, and sets read permission for Group and Others: chmod 1755 findReslts.sh: Sets sticky bit (this suggests that the script be retained in memory), sets read, write, and execute permissions for owner, and sets read and execute permissions for group and others chmod 4755 setCtrls.sh

  4. setuid - Wikipedia

    en.wikipedia.org/wiki/Setuid

    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 ...

  5. Access-control list - Wikipedia

    en.wikipedia.org/wiki/Access-control_list

    These entries are known as access-control entries (ACEs) in the Microsoft Windows NT, [4] OpenVMS, and Unix-like operating systems such as Linux, macOS, and Solaris. Each accessible object contains an identifier to its ACL. The privileges or permissions determine specific access rights, such as whether a user can read from, write to, or execute ...

  6. File attribute - Wikipedia

    en.wikipedia.org/wiki/File_attribute

    In Unix and Unix-like systems, including POSIX-conforming systems, each file has a 'mode' containing 9 bit flags controlling read, write and execute permission for each of the file's owner, group and all other users (see File-system permissions §Traditional Unix permissions for more details) plus the setuid and setgid bit flags and a 'sticky' bit flag.

  7. umask - Wikipedia

    en.wikipedia.org/wiki/Umask

    $ umask-S # Show the (frequently initial) setting u=rwx,g=rx,o=rx $ gcc hello.c # compile and create executable file a.out $ ls-l a.out-rwxr-xr-x 1 me developer 6010 Jul 10 17:10 a.out $ # the umask prohibited Write permission for Group and Others $ ls > listOfMyFiles # output file created by redirection does not attempt to set eXecute $ ls-l ...

  8. Unix security - Wikipedia

    en.wikipedia.org/wiki/Unix_security

    All files in a typical Unix filesystem have permissions set enabling different access to a file. Unix permissions permit different users access to a file with different privilege (e.g., reading, writing, execution). Like users, different user groups have different permissions on a file.

  9. sudo - Wikipedia

    en.wikipedia.org/wiki/Sudo

    sudo (/ s uː d uː / [4]) is a program for Unix-like computer operating systems that enables users to run programs with the security privileges of another user, by default the superuser. [5] It originally stood for "superuser do", [ 6 ] as that was all it did, and this remains its most common usage; [ 7 ] however, the official Sudo project ...