lammps/tools/xmgrace/logplotawk.oneliner

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# This 1-liner will extract all lines from
# the 3rd run in a log file and plot
# column 8 against column 1
#
# By Karl Hammond karlh at ugcs.caltech.edu
awk '/Step/ {n++} /Step/,/step/ {if (n==3) print}' log.lammps | grep -iv step | xmgrace -block - -bxy 1:8