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a sample script below will go through all csv files in the current directory and rename files with current date:
#!/bin/ksh
today=$(date '+%Y%m%d');
for fname in *.csv; do
...

DT=$( date +"%Y%m%d" )

for file in DIR_A/*.csv
do
fname="${file##*/}"
echo mv "$file" "DIR_B/${fname%.csv}${DT}.csv"
done

Remove echo if output looks good. Replace DIR_A,...

perl -e 'while (<>) { if (! /\|$/ ) { chomp; } print ;}' input.dat > output.dat

should work assuming the correct end of line is always preceeded with a '|' character.

If you have trailing...