A sample line from a.txt:
01201 095440 sd10 3393.2 1.1 13572.8 4.4 0.0 1.0 0.3 2 91
awk '{h=substr($2,1,2);\ m=substr($2,3,2);\ s=substr($2,5,2);\ $2=sprintf("%s:%s:%s",h,m,s);\ print $0;}' a.txt | head
Will produce the following out put:
101201 09:54:40 sd10 3393.2 1.1 13572.8 4.4 0.0 1.0 0.3 2 91
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