unix - head AND tail of file

Question

Say you have a txt file, what is the command to view the top 10 lines and bottom 10 lines of file simultaneously?

i.e. if the file is 200 lines long, then view lines

Answer 1

You can simply:

(head; tail) < file.txt

And if you need to uses pipes for some reason then like this:

cat file.txt | (head; tail)

Note: will print duplicated lines if number of lines in file.txt is smaller than default lines of head + default lines of tail.