head

head is a simple utility that displays the first n lines of a file, or input. By default, it prints the first 10 lines. To control the number of lines printed, use the -n flag.

head myfile.txt
Output
line1
line2
line3
line4
line5
line6
line7
line8
line9
line10
head -n 3 myfile.txt
Output
line1
line2
line3