You need to use awk:
awk '{print $1,$3}' <namefile>
This simple command allows printing the first ($1) and third ($3) column of the file. The software awk is actually much more powerful. I think you should have a look at the man page of awk.
A nice combo is using grep and awk with a pipe. The following code will print column 1 and 3 of only the lines of your file that contain ‘p1’:
grep 'p1' <namefile> | awk '{print $1,$3}'
If, instead, you want to select lines by line number you can replace grep with sed:
sed 1p <namefile> | awk '{print $1,$3}'
Actually, awk can be used alone in all the examples:
awk '/p1/{print $1,$3}' <namefile> # will print only lines containing p1
awk '{if(NR == 1){print $1,$3}}' <namefile> # Will print only first line