tail/head all line except X last/first Lines
Solution 1:
tail -n+3 outputs the last lines starting from the third one.
Solution 2:
I know this is old, but for posterity.
given the input (as posted by OP),
cat << EOF > myfile
1
2
3
4
5
EOF
you can solve the problem using awk
awk 'FNR > 2 {print $1}' myfile
will yield desired result
3
4
5
tested with awk version (GNU Awk 4.1.4, API: 1.1 (GNU MPFR 4.0.1, GNU MP 6.1.2))