delete first few lines of a file in unix code example

Example 1: bash how to remove the first n lines of a file

# Example usage (3 options):
tail -n +43 input_file	# Print from the 43rd line on
sed 1,42d input_file	# Print from the 43rd line on
sed -i 1,42d input_file	# Remove the first 42 lines in place (meaning 
	# that the file is changed without having to print the output to a 
    # new file)

Example 2: delete first two lines of file linux

$ sed -i -e 1,3d vmr_nonprod