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└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
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.TH UNDIG 1 local
.SH NAME
undig \- undigestifying pager
.SH SYNOPSIS
.B undig
[
.B -{zhs}
.I size
] [
.B -m
.I mailer
] [
.B -p
] [
.B -P
] [
.I file
]
.SH DESCRIPTION
.I Undig
is a modest paging program like
.IR more (1),
which has one shining extension: it recognizes individial messages in an
ARPA-net style digest (actually any concatenation of mail or news
messages with Subject intact).
It is possible to skip to the next and previous message, to save a message
to a file, pipe it through a command or reply to it by mail.
.PP
Commands are in
.IR rn (1)-style
(which itself implements an extension of a subset of the commands of
.IR more (1)).
Type
.I h
for a command list.
.PP
.I Undig
pages the file given as argument, or its standard input if no argument.
Standard input may come from a pipe without loss of functionality.
Options recognized are the following:
.IP "\f3-z\fP \f2size\fP, \f3-h\fP \f2size\fP, \f3-s\fP \f2size\fP"
Set the number of lines for a full page (-z), a half page (-z) and the
number of lines displayed at the start of a message.
The defaults are the terminal's screen size minus 1, half that, and
one third, respectively.
.IP "\f3-m\fP \f2mailer\f"
Sets the command used to reply to a message.
.I Mailer
should be a printf format string with one or two %s escapes.
The first is replaced by a file containing the proposed headers for the
reply, the second by a file containing the oroginal message.
The default is ``Rnmail -h %s %s''.
.IP \f3-p\fP
Causes the screen to be cleared before each new message is printed.
.IP \f3-P\fP
Causes the screen to be cleared before a full page is printed.
.SH FILES
/dev/tty
.br
/tmp/@undig*
.br
Rnmail
.SH SEE ALSO
rn(1), more(1), less(1), Rnmail(1), mail(1), mh(1)
.SH DIAGNOSTICS
Complaints about bad command line options and files it can't open.
.br
Beeps for unknown commands.
.SH BUGS
It should have more parameters, notably in the area of message
recognition and header processing.
.br
Some internal buffers are not checked for overflow (but it is unlikely
to hit the limits with ordinary digests).
.br
Write errors and the like go undetected.
.br
On terminals with certain kinds of `magic' in their line wrapping,
the space needed by lines that are multiple of the screen width long is
calculated wrong.
This may cause the pager to prompt too early (never too late).
.br
Control characters in the file are not suppressed, so beware of escape
sequences.
.br
Messages written to files have the leading white space of each line
`normalized', i.e., tabs are substituted for strings of spaces whenever
possible.
.br
String searching has various limitations and bugs which you should find
out for yourself.