Usage of & quot;-& quot; in shell

The usage of "-" in shell tar-cvf-/home | tar-xvf-what is the meaning of the preceding command? In particular, the usage of several specific tar commands-www.2cto.com is not detailed. Copy/home to the current directory. -Cvf, followed by the tar command, indicates that the following letter is the option of the tar command. c Indicates packaging, v indicates displaying the execution process, and f indicates the file generated after packaging. Then, follow the minus sign next to f. Here it refers to the standard output stream. The first half of the sentence means to package/home in the output stream. Connect the second half with the pipe sign |. The first half of the output stream of www.2cto.com is used as the input parameter of the second half. The stream is represented by a minus sign here. The second half is the tar command. This time, option x is to unpackage. The complete last half of the sentence means to unpack the content in the input stream to the current directory. The effect of the entire sentence is the same as that of cp/home.