问题
So I am going along and moving a bunch of files
mv /source /dest &
mv /source/* /dest/dest/ &
...
...
then I get careless and
mv /source/filena* /dest/dest/ *
OMG! ^c^c^c^c
[No Response from terminal command]
What is actually going on here?
What happens when I put an * (asterisk) at the end of a command instead of an & (ampersand)?
回答1:
The shell expands the wildcard *. The mv command never sees the wildcard, only the result of the expansion.
The wildcard * expands to the list of files in the current directory in lexicographic order. If the last file is a directory, then all the preceding files (/source.filenafoo, /source/filenabar, /dest/dest, hello) are moved to that subdirectory. If the last file is not a directory, mv complains that “target a.png is not a directory” (or words to that effect).
See What does mv ./* without specifying destination do? for more detailed examples.
回答2:
An asterisk at the end of a command line is treated the same way as an asterisk anywhere else on the line — it's a wildcard that matches zero or more characters. Specifically, in this instance, the * in mv /source/filena* /dest/dest/ * is replaced by the name of each & every file and folder in your current directory (except those beginning with a dot), and whatever happens to be last in this list is where mv is going to try to put everything.
来源：https://stackoverflow.com/questions/18324993/what-does-an-asterisk-at-the-end-of-a-mv-command-do