Shell Programming and Scripting

First impressions are to rewrite the script for efficiency and readability.
The "ls" is pointless and the "for" construct is prone to issues with filenames containing space characters and can collapse with large numbers of files.

Whether you use the shell inward redirect or "cat" is up to you. Imho "cat" is faster and makes the script easier to follow (others on this board differ).

Code:

cat "${WK_DIR}/file_list" | while read file
do
     IND=`echo "${file}" | cut -c10-10`
     case "${IND}" in
           "K"|"L"|"M"|"N"|"O"|"P"|"Q"|"R"|"S"|"W")
               mv -f "${SOURCE_DIR}/${file}" ${TARGET_DIR}"
               ;;
     esac
done

Looking at:
Why don't we:

Code:

awk '{ print substr($0, 10, 1), $0; }' "${WK_DIR}/file_list" | while read IND file
do

It is just a thought, but since we are already catting the file, why not merge in the "cut" as well.