Remove the first line from file / Remove first N lines from file

tail -n +2 someFile

*Notes: You MUST include the + sign or else the last 2 lines will be printed instead.

To remove N lines from the start of the file

tail -n +$M someFile

*NOTES: M = N + 1
You MUST include the + sign in-front of the number M or else the output will be the last M lines instead.