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is this command work?
ls -lt | awk '{ print $9 }' | cut -d "." -f1 | sed 's/[0-9]*$//g' | sort -u | while read line
do
ls "${line}"* | sort -r | tail -n +2
#~ ls "${line}"* | sort -r | tail...

why don't use sed or tr?

column_name="vivek"
column_name2="ViVeK"
column_name=$(echo $column_name | tr '[:upper:]' '[:lower:]')
column_name2=$(echo $column_name2 | tr '[:upper:]' '[:lower:]')...

I think, that's because of the typo.

echo "column name 2 lower: $coulmn_name2

it should be.

echo "column name 2 lower: $column_name2