CMD permanently delete specified folders and files

CMD Permanently delete the specified folder   /S Delete directory and all subdirectories and files under the directory    /Q  When the deletion can be cancelled, the system confirms to delete directly .
rd/s/q D:/test

CMD Delete file 
del 1.txt

fc one.txt two.txt > 3st.txt  Compare the two files and output the differences to 3st.txt In file ,"> " and "> >"  It's a redirection command 

start  A program name or command  /max  or /min  Open a new window and maximize （ To minimize the ） To run a program or command 

mem  see cpu usage