How can I reverse the order of lines in a file?

Question

I'd like to reverse the order of lines in a text file (or stdin), preserving the contents of each line.

So, i.e., starting with:

foo
bar
baz

I'd like to end up with

baz
bar
foo

Is there a standard UNIX commandline utility for this?

Answer 1

tac <file_name>

example:

$ cat file1.txt
1
2
3
4
5

$ tac file1.txt
5
4
3
2
1

Answer 2

If you happen to be in vim use

:g/^/m0