linux chapter 9
Which flag would you pass to tar in order to have it make a new archive?
-c
In the command tar -czf foo.tar.gz bar, what is the purpose of the f flag?
Tells tar to write to the file that follows the flag
Given the command tar -cvjf homedirs.tbz /home, which of the following are true? (choose two)
The command will print out each filename as it is processed The output file will be compressed
You try to compress a file that is already compressed. Which of the following statements is true?
The file will not be compressed any further than it already was
By default, the zip command replaces uncompressed files with compressed files. True or False?
true
Given a file called documents.zip, how can you see what's in it without extracting the files?
unzip -l documents.zip
Given a file called documents.zip, how can you extract just the files under ProjectX?
unzip documents.zip ProjectX/*
Which two programs use the Lempel-Ziv-Markov chain algorithm? (choose two)
xz gzip
Which of the following commands can be used to compress a file? (choose three)
zip bzip2 gzip
In general, for which of the following would you want to use lossless compression?
A log file
In the command tar -cvjf foo.tbz a b c, what are a, b, and c?
File names to be added to the archive
The three main modes of tar are: (choose three)
List Create Extract
Compression of a file works by
Removing redundant information
Lossy compression: (choose three)
Usually results better compression than lossless Is often used with images Sacrifices some quality
How would you obtain output similar to the following? compressed uncompressed ratio U-N 278168 1016950 72.6% tag
gzip -l tags
You type gzip myfile.tar. What happens? (choose two)
myfile.tar.gz holds a compressed version of myfile.tar myfile.tar is removed
Which command would you use to archive the Documents directory and compress it with bzip2 compression?
tar -cjf documents.tbz Documents
Which two commands do the same thing? (choose two)
tar -czf foo.tar.gz foo tar -c foo | gzip > foo.tar.gz
Which command will show what is inside the compressed tarball with a name of foo.tar.gz?
tar -tzf foo.tar.gz
You archived your users' directories into a file called backup.tar.gz. You then view the archive and see the filenames follow this convention: home/username/somefile
tar -xzf backup.tar.gz home/fred/
