UNIX for Dummies Questions & Answers

0780112843,0873599381,E,ISOL,ZAR,0.0035,O,1,20131116,4373200,0.21
0733001720,0873516499,E,ISOL,ZAR,0.0035,O,1,20131116,4331600,0.21
0731069010,0873550144,E,ISOL,ZAR,0.0105,O,3,20131116,4555400,0.21
0839440085,0873540000,E,ISOL,ZAR,0.0805,O,23,20131116,4510200,0.21
0736747788,0873540000,E,ISOL,ZAR,0.0805,O,23,20131116,3351300,0.21
0735600782,0873516481,E,ISOL,ZAR,0.035,O,10,20131116,3305100,0.21
0834538110,0873504345,E,ISOL,ZAR,0.0035,O,1,20131116,3544700,0.21
0836569560,0873537240,E,ISOL,ZAR,0.021,O,6,20131116,2194800,0.21
0832396855,0873540000,E,ISOL,ZAR,0.0805,O,23,20131116,4104000,0.21
0835829767,0873540000,E,ISOL,ZAR,0.0805,O,23,20131116,4041300,0.21
0835829767,0873540000,E,ISOL,ZAR,0.077,O,22,20131116,4044800,0.21
0835829767,0873540000,E,ISOL,ZAR,0.0805,O,23,20131116,4052400,0.21
0738907463,0873539690,E,ISOL,ZAR,0.0035,O,1,20131116,4082800,0.21
0838780516,0873516487,E,ISOL,ZAR,0.035,O,10,20131116,2263000,0.21
0710394006,0873550144,E,ISOL,ZAR,0.1855,O,53,20131116,4215800,0.21
0832924068,0873514889,E,ISOL,ZAR,0.0945,O,27,20131116,4411400,0.21
0787854993,0873504382,E,ISOL,ZAR,0.021,O,6,20131116,4321500,0.21
0733493939,0873550144,E,ISOL,ZAR,0.035,O,10,20131116,4395000,0.21
0781564696,0873504384,E,ISOL,ZAR,0.007,O,2,20131116,3002500,0.21
0732790849,0873540000,E,ISOL,ZAR,0.0525,O,15,20131116,4584500,0.21
0839440085,0873540000,E,ISOL,ZAR,0.07,O,20,20131116,4484000,0.21
0796403431,0312742529,E,ISOL,ZAR,0.021,O,6,20131116,4595300,0.21
0836826338,0114855676,E,ISOL,ZAR,0.056333,O,26,20131116,4424700,0.13
0733871277,0514444643,E,ISOL,ZAR,0.1155,O,33,20131116,2321800,0.21

perl -F, -ape '$F[8]=~s/(\d{4})(\d\d)(\d\d)/$1-$2-$3/;$_=join ",", @F' input

awk '{sub(/..$/,"-&",$9); sub(/..-/,"-&",$9)}1' FS=, OFS=, file