sed - How to arrange the lines in ascending order -


i have folder contains 200 pdb files.i arrange atom lines of pdb files in ascending order based on 6th column. in-place editing each pdb file in folder. appreciated.

atom     81  n   asn 248      38.791 -16.708  12.507  1.00 52.04           n  atom     82  ca  asn 248      39.443 -17.018  11.206  1.00 54.49           c  atom    422  c   ser 205      70.124 -29.955   8.226  1.00 55.81           c  atom    423  o   ser 205      70.901 -29.008   8.438  1.00 46.60           o  atom    303  n   met 231      61.031 -38.086  -3.054  1.00 52.32           n  atom    304  ca  met 231      60.580 -39.074  -4.047  1.00 64.11           c atom    392  c   glu b  65      23.248  10.071  -7.321  1.00 48.26           c   atom    393  o   glu b  65      24.465  10.200  -7.158  1.00 46.53           o atom    394  o   glu b  65      24.465  10.200  -7.158  1.00 46.53           o

desired output

atom    392  c   glu b  65      23.248  10.071  -7.321  1.00 48.26           c atom    393  o   glu b  65      24.465  10.200  -7.158  1.00 46.53           o atom    394  o   glu b  65      24.465  10.200  -7.158  1.00 46.53           o  atom    422  c   ser 205      70.124 -29.955   8.226  1.00 55.81           c   atom    423  o   ser 205      70.901 -29.008   8.438  1.00 46.60           o  atom    303  n   met 231      61.031 -38.086  -3.054  1.00 52.32           n atom    304  ca  met 231      60.580 -39.074  -4.047  1.00 64.11           c atom     81  n   asn 248      38.791 -16.708  12.507  1.00 52.04           n atom     82  ca  asn 248      39.443 -17.018  11.206  1.00 54.49           c

use sort.

sort -n -k 6 inputfile

-n performs numeric sort, , -k tells sort via key.

edit: in-place sorting, use -o option:

sort -n -k 6 inputfile -o inputfile

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