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/