wc

wc prints out the number of lines, words, and bytes in the specified file or in the input stream (from a pipeline). Type man wc to learn how to fine-tune what counts are displayed.

head

head prints out the first ten lines of a file or stream. Use the -n option to specify how many lines should be displayed.

tail

Prints out the last ten lines of a file or stream. Use the -n option to specify how many lines should be displayed.