--- /dev/null
+#!/usr/bin/perl
+#
+# watch the end of the current debug file (like tail -f) applying
+# any regexes supplied on the command line.
+#
+# There can be more than one <regexp>. a <regexp> preceeded by a '!' is
+# treated as NOT <regexp>. Each <regexp> is implcitly ANDed together.
+# All <regexp> are caseless.
+#
+# examples:-
+#
+# watchwsjtl g1tlh # watch everything g1tlh does
+# watchwsjtl -2 PCPROT # watch all PCPROT messages + up to 2 lines before
+# watchwsjtl gb7baa gb7djk # watch the conversation between BAA and DJK
+#
+
+require 5.004;
+
+# search local then perl directories
+BEGIN {
+ # root of directory tree for this system
+ $root = "/spider";
+ $root = $ENV{'DXSPIDER_ROOT'} if $ENV{'DXSPIDER_ROOT'};
+
+ unshift @INC, "$root/perl"; # this IS the right way round!
+ unshift @INC, "$root/local";
+}
+
+use IO::File;
+use SysVar;
+use DXUtil;
+use DXLog;
+
+use strict;
+
+my $fp = DXLog::new('wsjtl', 'dat', 'd');
+my $today = $fp->unixtoj(time());
+my $fh = $fp->open($today) or die $!;
+my $nolines = 1;
+$nolines = shift if $ARGV[0] =~ /^-?\d+$/;
+$nolines = abs $nolines if $nolines < 0;
+my @patt = @ARGV;
+my @prev;
+
+# seek to end of file
+$fh->seek(0, 2);
+for (;;) {
+ my $line = $fh->getline;
+ if ($line) {
+ if (@patt) {
+ push @prev, $line;
+ shift @prev while @prev > $nolines;
+ my $flag = 0;
+ foreach my $p (@patt) {
+ if ($p =~ /^!/) {
+ my $r = substr $p, 1;
+ last if $line =~ m{$r}i;
+ } else {
+ last unless $line =~ m{$p}i;
+ }
+ ++$flag;
+ }
+ if ($flag == @patt) {
+ printit(@prev);
+ @prev = ();
+ }
+ } else {
+ printit($line);
+ }
+ } else {
+ sleep(1);
+
+ # check that the debug hasn't rolled over to next day
+ # open it if it has
+ my $now = $fp->unixtoj(time());
+ if ($today->cmp($now)) {
+ $fp->close;
+ my $i;
+ for ($i = 0; $i < 20; $i++) {
+ last if $fh = $fp->open($now);
+ sleep 5;
+ }
+ die $! if $i >= 20;
+ $today = $now;
+ }
+ }
+}
+
+sub printit
+{
+ while (@_) {
+ my $line = shift;
+ chomp $line;
+ $line =~ s/([\x00-\x1f\x7f-\xff])/sprintf("\\x%02X", ord($1))/eg;
+ my ($t, $l) = split /\^/, $line, 2;
+ $t = time unless defined $t;
+ printf "%02d:%02d:%02d %s\n", (gmtime($t))[2,1,0], $l;
+ }
+}
+exit(0);