Use awk like this:
awk -v col=7 '{print $col}' file
Or to print 2 colimns:
awk -v col1=2 -v col2=7 '{print $col1, $col2}' file
OR to make it print multiple columns:
awk -v col='2:7' '{split (col, a, ":"); for (i in a) printf "%s%s", $a[i], OFS; print ""}' file