unix - Bash Shell Loop Over Set of Folders -

I have a list of folders for example each folder name:

• pippo1 file pippo1 .txt,
• With the pippo2 file pippo2.txt,
• Pippo3 file to Pippo3.txt etc.

  I want to go to the first folder, remove the number from the file name pippo1.txt, and then exit, go to another folder which named pippo2 a file named PPO2.txt, 2 file name Remove etc. I tried the following code, but it does not work! The code is:

    i in * for CD $ i ls * .txt. Sed -e "s / [0-9] // g" cd .. done   
   What am I doing?   
   
   
   If the requirements are only so simple, then you can do this only with bash replacements:  
    Find in file -name 'Pippo * .txt'`; MV $ file $ {file / [0-9] .txt / .txt}   
   However, this file will fail more than single digits in the file name, e.g.  pippo999 / pippo999.txt . It can be addressed by setting the  extglob  option:  
    to find the file in the extnglob of shopt -s. -name 'pippo * .txt'`; MV $ file $ {file / + ([0-9]). Txt / .txt} done   
    Bash file globing created in + (...)  is available only when  extglob  is set it happens.  
   Instead of carrying the directory tree with the loop and  cd , it uses   to get the list of all related files, then Lose the list of file names that will be of the form:  .pippoN / pippoN.txt . Rename uses Bash to get the modified file name. See also.  
   Note that the blank space in the file or directory names will  break this approach , using the  search : there is a way in which the blank Locations will be split into many tokens around empty spaces, each token list has a different result in the iterator. So if you need to expect space characters in paths, then it becomes a bit more complex:  
    shopt -s extglob IFS = $ '\ n' Find 'in the file - Name 'Pippo * .txt'`; "MAV" $ $ file "" $ {file / + ([0- 9]). Here we have cited the file name for the  MV  command, which will handle the empty space properly, and we have the field separator Has been changed to  IFS  so that Bash can not recognize white space as a word boundary. This loop will fix the problem with  find  in the iterator Now empty in the path The location will be handled correctly, so that the name of  ./ pippo 9 / pippo9.txt  will also be changed:  ./pippo 9/pippo.txt .