bash - Storing the first 4 characters of a filename into a variable -

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This follwing code I'm writing is part of a script. Now, for the purposes of this script, I am assuming that ./src only has 1 file, so this loop should execute only once. Now, somewhere in the loop, I want to take the first 4 characters of $ F (filename) and store it in another variable. I know that there is a cut command, but I'm not sure how to use it here or here because I thought the cut was used for the content of the files but not the file itself. 

  `ls. / Src` do HO $ F CD TMP F = "... / src / $ f" sh "$ f" done    
 
 
  $ {string: position: length}  $ string $ $ to extract $ x length letter extract   
  Example   
  shortName = $ {f: 0} 4}   
 Have fun!

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