66.
Which of the following commands are commonly used to create archive files? (Select two.)
- A.restore
- B.vi
- C.tape
- D.cpio
- E.tar
- Answer & Explanation
- Report
Answer : [D, E]
Explanation :
Explanation :
| The cpio and tar programs are common Linux archive-creation utilities, so options D and E are both correct. The restore command restores (but does not back up) data; its backup counterpart command is dump. Thus, option A is incorrect. The vi command launches a text editor; it’s not used to create archives, so option B is incorrect. There is no standard tape command in Linux, so option C is incorrect. |
67.
You’ve received a tarball called data79.tar from a colleague, but you want to check the
names of the files it contains before extracting them. Which of the following commands
would you use to do this?
- A.tar uvf data79.tar
- B.tar cvf data79.tar
- C.tar xvf data79.tar
- D.tar rvf data79.tar
- E.tar tvf data79.tar
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| With the tar utility, the --list (t) command is used to read the archive and display its contents. The --verbose (v) option creates a verbose file listing, and --file (f) specifies the filename—data79.tar in this case. Option E uses all of these features. Options A, B, C, and D all substitute other commands for --list, which is required by the question. |
68.
You want to create a link from your home directory on your hard disk to a directory on a
CD-ROM drive. Which of the following types of links might you use?
- A.Only a symbolic link
- B.Only a hard link
- C.Either a symbolic or a hard link
- D.Only a hard link, and then only if both directories use the same low-level filesystem
- E.None of the above; such links aren’t possible under Linux
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
| Symbolic links can point across filesystems, so creating a symbolic link from one filesystem (in which your home directory resides) to another (on the CD-ROM) isn’t a problem, making option A correct. Hard links, as in options B, C, and D, are restricted to a single filesystem and so won’t work for the described purpose. Because symbolic links will work as described, option E is incorrect. |
69.
What command would you type (as root) to change the ownership of somefile.txt from
ralph to tony?
- A.chown ralph:tony somefile.txt
- B.chmod somefile.txt tony
- C.chown somefile.txt tony
- D.chmod tony:ralph somefile.txt
- E.chown tony somefile.txt
- Answer & Explanation
- Report
Answer : [E]
Explanation :
Explanation :
| Option E is the correct command. Typing chown ralph:tony somefile.txt, as in option A, sets the owner of the file to ralph and the group to tony. The chmod command used in options B and D is used to change file permissions, not ownership. Option C reverses the order of the filename and the owner. |
70.
Typing ls -ld wonderjaye reveals a symbolic file mode of drwxr-xr-x. Which of the following
are true? (Select two.)
- A.wonderjaye is a symbolic link.
- B.wonderjaye is an executable program.
- C.wonderjaye is a directory.
- D.wonderjaye has its SUID bit set.
- E.wonderjaye may be read by all users of the system.
- Answer & Explanation
- Report
Answer : [C, E]
Explanation :
Explanation :
| The d character that leads the mode indicates that the file is actually a directory (option C), and the r symbol in the r-x triplet at the end of the symbolic mode indicates that all users of the system have read access to the directory (option E). Symbolic links are denoted by leading l characters, which this mode lacks, so option A is incorrect. Although the x symbols usually denote executable program files, as specified in option B, in the case of directories this permission bit indicates that the directory’s contents may be searched; executing a directory is meaningless. SUID bits are indicated by an s character in place of the owner’s execute bit position in the symbolic mode. Since this position holds an x in this example, option D is incorrect. |
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