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Terms in this set (36)adduser or useradd command is to add a new user account passwd command sets a user's password userdel removes user account groupadd adds a group to the system groupdel command removes a group from the system groups command list the groups that a user belongs to id command lists the GIDs of groups that a user belongs to chown command changes the ownership of a directory or file chgrp command changes the group owner of a file or directory also chown command can be used to change both the file owner and the group owner of a file or directory at the same time mode section of the inode that stores permissions for a file user refers to the owner of a directory group owner refers to the users with the ability to change permissions on a file or directory other refers to all of the other users on the Linux system Three permissions that may be assigned to each user Read, write, execute the mode is broken down into user, group, other The root user supersedes all file and directory permissions. The root user has all permissions to every file and directory regardless of what the mode of the file or directory indicates. The root user supersedes all file and directory permissions. The root user has all permissions to every file and directory regardless of what the mode of the file or directory indicates. Permissions are not additive. Permissions are not additive. Read permission Definition for files: Allows a user to open and read the contents of a file Write permission Definition for files: Allows a
user to open and read the contents of a file Execute permission Definition for files: Allows a user to execute a file in memory . Some implications of these permissions are a user with read only permission for a file can open the file and make changes to it but cannot save the changes in the file. . Some implications of these permissions are a user with read only permission for a file can open the file and make changes to it but cannot save the changes in the file. Shell scripts are text files containing instructions for the shell to execute. The user must have execute permission to run these scripts. Shell scripts are text files containing instructions for the shell to execute. The user must have execute permission to run these scripts. To add or remove a file from a directory, the user must have write permission to that directory To add or remove a file from a directory, the user must have write permission to that directory A user with write permission to a directory has the ability to delete all files and subdirectories within it. A user with write permission to a directory has the ability to delete all files and subdirectories within it. A user who does not have the execute permission to a directory is prevented from listing the directory's contents, adding and removing files, and working with files and subdirectories inside that directory, regardless of what permissions he/she has to them. A user who does not have the execute permission to a directory is prevented from listing the directory's contents, adding and removing files, and working with files and subdirectories inside that directory, regardless of what permissions he/she has to them. A quick way to deny a user from accessing a directory and all of its contents in Linux is to take away the execute permission on that directory. A quick way to deny a user from accessing a directory and all of its contents in Linux is to take away the execute permission on that directory. ... command allows you to assume the identity of another user. You can either start a new shell session with that user's ID or issue a single command as that user. sudo (super user do...) command allows an administrator to set up a configuration file called /etc/sudoers and define specific commands that particular users are permitted to execute under an assumed identity chmod command changes the mode (permissions) of files or directories. umask(usermask) If these default permissions are too permissive, a special variable on the system named __________________________ takes away permissions on new files and directories immediately after they are created. This command is meant to be used for newly created files and directories. umask The __________________________ command displays the umask of a file. SUID(set user id) If __________________________ is set on a file, the user who executes the file temporarily becomes the owner of the file during execution. It has no functionality when it is set on a directory. It is only applicable to binary compiled programs. Any user can test network connectivity with the ping command. SUID(set group id) The __________________________ is applicable to both files and directories. If it is set on a file, the user who executes the file becomes a member of the group that is attached to that file during execution. If it is set on a directory, the user's name becomes the owner of the file and the directory's group becomes the group owner of the file. sticky bit The __________________________ was previously used on files in the past to lock them in memory. However, they are currently applicable to directories. This ensures that a user can only delete his/her own files in a directory. authentication __________________________ is used to verify a user's identity. It is usually done by comparing the username and password to a system database. Sets with similar termsChapter 9 Linux Command line Permissions124 terms Linux47 Unix/Linux Users and Permissions Review26 terms sarah8937 CPT 176 Ch. 1326 terms Sal_Rains cna 113 chapter 14108 terms jimmy_knight1 Sets found in the same folderCIS330 Linux Chapter 7 Part 3 7.7 - 7.1246 terms falonscyoc CIS330 Linux 7 Study Guide Questions18 terms falonscyoc CIS330 Linux 4.1 - 4.748 terms falonscyoc CIS330 Linux 4.16 -24 terms falonscyoc Other sets by this creatorINS211 Chapters 15 - 1941 terms falonscyoc MGT340 Chapter 1835 terms falonscyoc MGT340 Chapter 1539 terms falonscyoc MGT340 Chapter 1436 terms falonscyoc Verified questions
COMPUTER SCIENCE Consider a system consisting of processes $$ P_1, P_2, ..., P_n $$ , each of which has a unique priority number. Write a monitor that allocates three identical printers to these processes, using the priority numbers for deciding the order of allocation. Verified answer COMPUTER SCIENCE T F When a node is inserted into a tree, it must be inserted as a leaf node. Verified answer
COMPUTER SCIENCE Which of the following is not a valid rule of Boolean algebra? a) (True or x) == True b) (False and x) == False c) not(a and b) == not(a) and not(b) d) (True or False) == True Verified answer COMPUTER SCIENCE How do I write a program to calculate the nth Fibonacci number? Verified answer Recommended textbook solutions
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What section of a file system contains information about the file system in general?The central concepts are superblock, inode , data block, directory block , and indirection block. The superblock contains information about the filesystem as a whole, such as its size (the exact information here depends on the filesystem). An inode contains all information about a file, except its name.
Which command will confirm the system directory that you are currently in?The pwd command is used to display the current working directory.
What is a sticky bit quizlet?The "sticky bit" permission... ... prevents others from removing files they don't own from a common directory. Which of the following commands will set the "sticky bit" on /shared ? chmod 1777 /shared.
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What permission when applied to a directory allows a user to enter the directory and work with directory contents quizlet?
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