[LBo] I'm trying to like it ...

[Chris F.A. Johnson]

On Wed, 24 Jan 2007, Douglas Orchard wrote:

>> ...my newly installed OpenSuSE 10.2, that is.  Some things don't exist
>> in this version that I've come to depend on over the years, such as "lc"
>> and "uc" which do wholesale lowercase and uppercase filename
>> conversions.  These are not installed (duh) and don't exist on the
>> installation media (downloaded CDs).  Other stuff that IS installed also
>> doesn't work:
>>
> For uppercase to lowercase try this simple bash script
>
> #! /bin/bash
> #
> # Changes every filename in working directory to all lowercase.
> #
> # Inspired by a script of John Dubois,
> # which was translated into into Bash by Chet Ramey,
> # and considerably simplified by Mendel Cooper, author of this document.
>
>
> for filename in *                # Traverse all files in directory.
> do
>   fname=`basename $filename`

     There is no need for an external command; bash can do it
     internally:

fname=${filename##*/}

>   n=`echo $fname | tr A-Z a-z`  # Change name to lowercase.

    That will fail if $fname has leading or trailing spaces.

>   if [ "$fname" != "$n" ]       # Rename only files not already lowercase.
>   then
>   mv $fname $n

    That will fail if there are any spaces or other pathological
    characters in the filename.

>   fi

    Rather than run all filenames through an external command, first
    check whether any changes need to be made:

case $filename in
      *[A-Z]*) n=`printf "%s\n" "$fname" | tr A-Z a-z`
               mv -i -- "$fname" "$n"
               ;;
esac

    You can speed up the script even more by using a dynamically
    loadable builtin to change case. See my article at
    <http://www.unixreview.com/documents/s=10089/ur0606a/ur0606a.htm>.

> done
>
> exit 0
>
> The original author is credited in the comments.

-- 
    Chris F.A. Johnson                      <http://cfaj.freeshell.org>
    ===================================================================
    Author:
    Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)