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thanks for pointing it out, made appropriate correction in post#2

In addition to the above posts, the script in post #1 contains obvious typing errors. The inconsistent spelling of all references to what probably should be $UPDATE .

The proper advice would be to use weak quotes
ls "$FILE" | grep -v "$UPDATE.csv"

Better to use find if it has -mtime:


find . -name '*.csv' -mtime +1 -exec rm {} \;


That would delete .csv files older than 1 day.

loose the quotes and ^ . Quotes wont allow your variable to expand, and ^ searches for file name starting with variable name, which in your case is at the end/middle. use following
ls $FILE | grep...

#!/bin/ksh

DATE=`date +"%d%h%Y"`
DIR="/data/rfs/"
FOLDER="Test"
TARGET="${DIR}${FOLDER}"

UDATE="$(echo $DATE | tr '[a-z]' '[A-Z]')"

ls "${TARGET}" 2>/dev/null | grep -v "${UDATE}" | while...

ls $FILE | grep -v "$UPPDATE" will list files other than todays date check -v option of grep.
Other alternative to delete such files is
find $FILE -maxdepth 1 ! -name \*"$UPPDATE"* -exec rm {} \;