@(#)tac.1 1.2 06/05/86

tac - concatenate and print files in reverse tac [ -string ] [ +string ] [ file ... ] Tac reads each file in sequence and writes it on the standard output, reversed by the file segments delimited by string. -string specifies segments bounded on the left by string, while +string specifies right-bounded segments. The default is +\en (print lines in reverse order). If no input file is given, or if the argument `-' is encountered, tac reads from the standard input. Note that in this case tac 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:

prints out the hard errors on MASSBUS disk drives, most recent first. cat(1), rev(1), tail(1), tmail(1) Tac 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', tac uses a temp file but it doesn't have to.