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$ awk '{print $1,"\t",(($2+$3)/2)-x,"\t",(($2+$3)/2)+x,"\t",$4,"\t",$5}' x=500 file.txt
cX 165112764 165113764 27 96.7
cX 165142764 165143764 14 53.73
cX 1.65325e+08 ...

Hi, could you please provide few of sample lines from your input file.

Use printf:

e.g.

$ awk -F ":" '{sum+=$NF} END {print sum}' data.txt
1.27084e+10

$ awk -F ":" '{sum+=$NF} END { printf ("%0.0f\n", sum)} ' data.txt
12708429091

$ awk -F ":" '{sum+=$NF}...