find files that have number in file name greater than

You may use seq for that, but it works only if all files have same naming convention:

seq -f "%02g-a.txt" 6 10
06-a.txt
07-a.txt
08-a.txt
09-a.txt
10-a.txt

I.e.:

cat `seq -f "%02g-a.txt" 6 10` > bigfile.txt

It will cat all files named as "< numeric_value >-< rest >" and having this < numeric_value > greater than $LIM.

Even if they are written with one single digit (like 5), with two digits (like 05), or more...

And even if the < rest > are different among the files.

LIM=5
for file in $(ls);
do
   number=$(echo $file | cut -f1 -d'-');
   [ $number -gt $LIM ] && cat $file >> bigfile.txt;
done

Assuming the folder contains only these files.

This would list all files where the number is > 5

ls [0-9]* | awk -F '-' '{if ($1 > 5) print $0}'

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