HowTo: Work with Awk1
a) Use tab as column separator:
awk -v OFS='\t' '{print $1, $2}' file.txt
b) Downsample ‘anterior/posterior’ sources locations:
awk '($1 % 5 == 0) && ($2 % 5 == 0) && ($3 % 5 == 0) \
{printf("%5.0f %5.0f %5.0f\n", $1/5, $2/5, $3/5);}' anterior_b > file
c) Skip first two fields and print the rest of line:
awk '{print substr($0, index($0,$3))}' file.txt
d) Generate multiple consecutive column numbers:
seq -s ", $" 1 8 | sed 's/.*/{print $&}/'