Adjust commands to work irregarding to download location

[kant2002]

No description provided.

[sunhaiyong1978]

此处有注释，说明源码存放在家目录中，建议继续保留"~/"路径。

[kant2002]

Reason why I decide propose this change following - All commands in this guild seems to be works just fine without assumption of home location if execute sequentially. I cannot get the proper tone of the original document, so maybe I miss that in automated translation. Usually I seen proposed location as a hint to simplify writing complicated commands, so reader just can copy-paste without too much thought. This is just step further in that direction. I obviously do not insist on this change.