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Annotation of 43BSDTahoe/new/tac/tac.1, revision 1.1.1.1

1.1       root        1: .\"    @(#)tac.1       1.2 6/5/86
                      2: .\"
                      3: .TH TAC 1 "June 5, 1986"
                      4: .SH NAME
                      5: tac \- concatenate and print files in reverse
                      6: .SH SYNOPSIS
                      7: .B tac
                      8: [
                      9: .B \-string
                     10: ] [
                     11: .B +string
                     12: ] [ file ... ]
                     13: .SH DESCRIPTION
                     14: .I Tac
                     15: reads each
                     16: .I file
                     17: in sequence
                     18: and writes it on the standard output, reversed by the file segments
                     19: delimited by
                     20: .I string.
                     21: .I \-string
                     22: specifies segments bounded on the left by
                     23: .I string,
                     24: while
                     25: .I +string
                     26: specifies right-bounded segments.
                     27: The default is
                     28: .I +\en
                     29: (print lines in reverse order).
                     30: If no input
                     31: .I file
                     32: is given, or if the argument `-'
                     33: is encountered,
                     34: .I tac
                     35: reads from the standard input.  Note that in this case
                     36: .I tac
                     37: stores the entire standard input in a temporary
                     38: file before it outputs anything, so for large input it is slow.
                     39: .SH EXAMPLES
                     40: .RS
                     41: tac '-\e
                     42: .br
                     43: From\ ' /usr/spool/mail/$USER
                     44: .RE
                     45: prints out one's mail messages, most recent first.
                     46: .PP
                     47: .RS
                     48: tac file
                     49: .RE
                     50: prints the file in reverse, line by line, and:
                     51: .PP
                     52: .RS
                     53: tac /usr/adm/messages | egrep 'hp.*hard'
                     54: .RE
                     55: prints out the hard errors on MASSBUS disk drives, most recent first.
                     56: .SH SEE ALSO
                     57: cat(1), rev(1), tail(1), tmail(1)
                     58: .SH BUGS
                     59: .I Tac
                     60: doesn't handle multiple argument files exactly right, and it's
                     61: also unclear in which order they should be processed.
                     62: .br
                     63: If invoked as `tac < file', 
                     64: .I tac
                     65: uses a temp file but it doesn't have to.

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