How to batch file rename TI .dsk files: "filename.dsk"
 that were converted to HxC .hfe files
     and now have the following format: "filename"_dsk.hfe
                     want to change to: "filename".hfe
 so that the total filename is shorter and easier to read on the HxC display,
 which scrolls and is illegible with names over 15 total characters.  They will
 run otherwise, just hard to read!

UNIX COMMAND:
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe

EXPLANATION:
rename = rename files
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe
       -v = verbose display the files worked on
       
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe       
          's/ = 'switch/old/new/' command beginning
          
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe          
             \ = treat following underline character as what it is, not a command shortcut
             
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe             
              _dsk = unwanted characters in filename
              
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe              
                  \ = treat following dot character as what it is, not a command shortcut
                  
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe                  
                   .hfe current extension
                   
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe                   
                       / = end of old command 
                       
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe                           
                        \ = treat following dot character as what it is, not a command shortcut
                        
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe                         
                         .hfe = new extension
                         
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe                         
                             /' = switch /old/new/ command closing characters
                             
rename -v 's/\_dsk\.hfe/\.hfe/' *hfe                             
                         (space)*hfe = only work on all files with this extension 

Batch files like this saved me a TON of typing when renaming the files on this disk!