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ls energy.dat.*|sort -rn|head -1

Try this:
energy.dat.* | awk -F\. 'm<$NF{m=$NF;s=$0}END{print s}'

if you want it to store in a variable , just use the below command:

max_number=`ls energy.dat.*|sort -rn|head -1`

A slight modification to vbe's one-liner:

ls energy.dat.* | sort -nrk1.12 | head -1

Hi,
Could you please explain how that command behaved without key -k specification .
I don't have unix to test it currently

Thanks