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The file you are trying to list does not exist

if ls ${src}_*/*.CTL &> /dev/null; then
echo "yes files are there"
else
echo "No files"
fi

Try:
if [ $(ls ${src}_*/*.CTL 2>/dev/null|wc -l) -gt 0 ]; thenor:
if ls ${src}_*/*.CTL >/dev/null 2>&1; then

How about this:

awk '
{
col=$0
line=$0
gsub(/ *= .*/, "", col)
gsub(/^[^=]*= /, "", line)
if (!(col in COLS)) {
head=head OFS col
TITLE[++cols]=col
...

The tape has an option: -i if used when generating the tape... If it were not the case the tape process as you have seen can be interrupted to go in interactive mode, but this is of no use unless...