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Remove the "<>" around the file names

dd if=File1.dat of=File1Final.dat cbs=95 conv=unblock

All in awk:

awk '{ $1 = $1 ".txt" ;if (a[$1]) { a[$1] = a[$1] "\n"; }; a[$1] = a[$1] "Fi Na=" $2 " no=" $3;} END { for (i in a) { print "Hello\nprl\n" a[i] "\nbye\nq" > i } }' A.txt

the unix command "head" is made for that type of operation. Use the following operation.

to remove the last two line of a file use:

head -n-2 yourfile

You were close in your piece of code...

use
awk '$1 ~ "\\."' file

You may want to write an awk script...

put the following into a file "filter.awk"
{
if ($0 ~ /^-/) { dash++ } else { if (dash==1) {out[++outcnt] = sprintf("%s %s",$1, $2) } }
if...

awk '{ if ($14 ~ /-/) {gsub("-","",$14); gsub("$","-",$14) } print }' yourfile

It is not good programming practice to perform the read/write the way you describe but the following will fix it (yes, you need both "close" statements)

BEGIN{FS=OFS="|"; myfile =...