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man bash:
So - the tr variable doesn't seem to start with the chars TR.

echo $a | awk '{printf("%9.9s\n", $1 "00000000")}'
or with your latest example:
awk '{printf("%9.9s\n", $1 "00000000")}' input

It can also be done either of the below way:

awk '{print $1 " " $2 " " $3 " " $6 " " $7 " " $8 " " $9}' file

awk '{$4=" "; $5=" "; print}' file

Is this what you were looking for?

It is because of the back ticks. Try:
a=$(echo "$str" | sed 's/</\\</g')
echo "$a"

or
a="${str%%<*}\\<${str#*<}"

or (bash/ksh93)
a=${str/</\\<}


--
with back ticks:
a=`echo "$str" |...