x: This option tells tar to extract the files.
x告诉tar指令去提取文件
v: The “v” stands for “verbose.” This option will list all of the files one by one in the archive.
v指令： v代表冗长的，这个指令会一一列出所有的档案文件
z: The z option is very important and tells the tar command to uncompress the file (gzip).
z指令：z非常重要，它能够告诉tar指令去解压文件
f: This options tells tar that you are going to give it a file name to work with.
f指令：这个指令告诉tar指令你将要去给正在操作的文件一个名字
xvzf 解压
how to compress a whole directory in linux
tar -zcvf filename.tar.gz directory-name
zcvf
-z : Compress archive using gzip program in Linux or Unix
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压缩档案文件
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-c : Create archive on Linux
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在linux下创建档案文件
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-v : Verbose i.e display progress while creating archive
v指令： v代表冗长的，这个指令会一一列出所有的档案文件
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f means the following argument is a f̱ilename.
