CD usage in makefile

Today, when I wrote the MAKEFILE file, I found a very strange problem, that is, the CD Change directory does not take effect in any case.

 

At last, Google went down and found that CD was only used in the beginning, which is a bit interesting.

 

For example, if you want to run makefile in/opt and tar to open a package in/lib:

CD/LibTar-Xvf XXXX.Tar

The result will only unpackage the tar package in the current directory where the makefile is executed/OPT.

 

The correct syntax is:

CD/lib &&Tar-Xvf XXXX.TarOr CD/LIB;Tar-Xvf XXXX.Tar