Term
| UNIX provides what three mechanisms to protect a users files? |
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Definition
| password, encryption, and access permission |
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Term
| The most fundamental scheme for protecting user files is to give every user a ___ ___ and a _____. Every user of a UNIX-based computer system is assigned these. |
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Definition
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Term
| All login names are ______ _____ and can be found in the ______ file. |
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Definition
| public knowledge /etc/passwd |
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Term
| The three primary ways of discovering a user's password: |
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Definition
| owner tells, password is guessed, brute force |
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Term
| the process of converting a file to a form that is completely different from its original version. |
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Definition
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Term
| the process of converting a file back to it's original form. |
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Definition
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Term
| the UNIX command _____ can be used to encrypt an decrypt your files. |
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Definition
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Term
| As file owner, you can attach certain _____ _____ to your files that dictate who can and cannot access them for various types of file operations. |
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Definition
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Term
| Three types of users in the UNIX system. |
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Definition
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Term
| When the ___ is set for a program, the system tries to keep the executable code for the program in memory or the swap space after it finishes. |
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Definition
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Term
| What command will allow a user to see the value of the bit mask used to set default file permissions for new files? |
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Definition
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Term
A file with the following permissions:
-rwxr-xr-x |
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Definition
| read and execute for all users, write for user only |
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Term
| A file whose owner has read, write, and execute permissions has file permissions equivalent to an octal value of: |
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Definition
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Term
| Why is issuing the command umask 000 a bad idea? |
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Definition
| it grants unlimited access to all new files and directories. |
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Term
| A permission value of 764 for the sample file means that: |
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Definition
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Term
| The root user has the authority to: |
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Definition
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Term
| If you want to set all three special access bits (SUID, SGID, and sticky) for the sample file and set the rest of its access bits to 754 with one command: |
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Definition
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Term
| The command: chmod 600 sample : |
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Definition
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Term
| What types of files are candidates for having the execution access permissions set for users? |
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Definition
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Term
| The set-user-ID bit (SUID) allows an executable file to: |
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Definition
| if this bit is set for a file containing an executable program it can take on the privileges of the owner of the file when it executes. |
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Term
| For a directory, users granted read permission are allowed to: |
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Definition
| read the directories contents |
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Term
| The execution of the umask command without argument: |
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Definition
| Displays the current mask value |
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Term
| File access permissions include: |
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Definition
| read, write, and execute. |
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Term
| File access permissions are grouped into the categories: |
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Definition
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Term
| A UNIX system administrator is: |
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Definition
| user id of 0, login name of root, commonly known as the superuser |
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Term
| Why is issuing the command umask 000 a bad idea? |
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Definition
| It permits all new directories and files to be read and changed by all users. |
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Term
| One special user who has access to all of the files on the system, regardless of the access privileges on the files. |
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Definition
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Term
| Command to display which groups on your system a user is a member of |
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Definition
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Term
| A bit value of zero is also denoted as ___. |
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Definition
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Term
| read permission on a directory allows you to do what? |
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Definition
| read the contents of a directory |
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Term
| write permission on a directory allows you to do what? |
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Definition
| create a new directory or file in it or to remove an existing entry from it. |
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Term
| execute permission on a directory allows you to do what? |
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Definition
| search the directory but not read or write to it. You cannot use the ls -l to list its contents or use the cd command to make it your current directory. |
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Term
| list directory entries instead of contents |
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Definition
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Term
| drwxr-x--- 2 u1753120 users 4096 Aug 18 18:00 mbox. List what each field stand for. |
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Definition
| file type and access permissions, number of links, owner, owner's group, file size in bytes, date, time, file name |
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Term
| displays the long lists for all the files and directories in a directory |
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Definition
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Term
| which command do you use to change access privileges for your files? |
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Definition
chmod [options] symbolic-mode file-list
example: chmod ugo-rw sample or chmod a-rw sample - does not let anyone read or write sample |
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Term
| which command do you use to change access privileges for your files? |
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Definition
chmod [options] octal-mode file-list
example: chmod 700 - set home directory to rwx for the owner and no privileges for anyone else. |
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Term
| what permissions must you have on a directory to be able to list its contents? |
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Definition
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Term
| what permissions must you have on a directory to be able to be able to create a file in it? |
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Definition
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Term
| Search permission on a directory is the same as what? |
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Definition
| execute permission. Allows you to make a directory your current directory. |
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Term
| Which command sets access permission bits on newly created files and directories to 1, except those bits that are set to 1 in the 'mask' |
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Definition
umask mask
file access permission = 777 - umask (usually 022).
777 is for directories
666 is for text files |
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Term
| if a file is owned by root and has the SUID fit set, it runs with what privileges? |
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Definition
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Term
| How do you set the Set-User-ID bit? |
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Definition
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Term
| How do you set the Set-Group-ID bit? |
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Definition
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Term
| The ___ bit works in the same manner as the SUID bit does, but it causes the access permissions of the process to take the group identity of the group to which the owner of the file belongs. |
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Definition
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Term
| How do you set the sticky bit? |
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Definition
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