tac \- concatenate and print files in reverse
and writes it on the standard output, reversed by the file segments
specifies segments bounded on the left by
specifies right-bounded segments.
(print lines in reverse order).
is given, or if the argument `-'
reads from the standard input. Note that in this case
stores the entire standard input in a temporary
file before it outputs anything, so for large input it is slow.
prints out one's mail messages, most recent first.
prints the file in reverse, line by line, and:
tac /var/log/messages | egrep 'hp.*hard'
prints out the hard errors on MASSBUS disk drives, most recent first.
cat(1), rev(1), tail(1), tmail(1)
doesn't handle multiple argument files exactly right, and it's
also unclear in which order they should be processed.
If invoked as `tac < file',
uses a temp file but it doesn't have to.