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what u tried ?

did u read the man page for sort ?

read about the -n option


$ cat test
34.dat
2.dat
16.dat
107.dat

$ sort -n test
2.dat
16.dat
34.dat
107.dat

awk '{$3=$2<1?"L":$2>2?"H":"M"}1' file1.dat

Assuming the value "0.00" occurs once in a record:
awk 'NR==FNR{a[NR]=$0; next}{sub("0.00",a[FNR])}1' file2.pdb file1.pdb

use awk intead of nawk

Place this script in the directory containing .dat files, then run it there.#!/usr/bin/perl
chomp(@files=`ls *.dat`);
for $i (@files){
open I, "$i";
$l=$m=$h=0;
while ($n=<I>){
chomp...

Hi, welcome to the forum. This would be one way of doing that:
mv "$file" "$(head -1 "$file")"