Differences

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--- perl:index [2009/08/13 09:56] – Links to command_line_options_with_usage changed to perl:command_line_options_with_usage tkbletsc
+++ perl:index [2010/01/08 13:50] (current) – tkbletsc
@@ Line 1: / Line 1: @@
-====== links ======
+====== Perl code snippets ======
-  * [[:real_csv_parsing]]
+  * [[Prototype class for OO]]
-  * [[:ansi_color]]
+  * [[Real CSV Parsing]]
-  * [[:sets]]
+  * [[ANSI color]]
-  * [[:dns_stuff]]
+  * [[Sets]]
-  * [[:make_a_loop_parallel]]
+  * [[DNS stuff]]
-  * [[:command_line_options_and_usage_with_getopt_long]]
+  * [[Make a loop parallel]]
-  * [[:command_line_options_and_usage_with_getopts]]
+  * [[Command line options and usage with Getopt Long]]
-  * [[command_line_options_with_usage]]
+  * [[Command line options and usage with getopts]]
-  * [[for_each_file]]
+  * [[command line options with usage]]
-  * [[forking_server]]
+  * [[For each file]]
+  * [[Forking server]]
   * [[kvpff]]
-  * [[loop_with_timekeeping]]
+  * [[Loop with timekeeping]]
-  * [[single_document_web_server]]
+  * [[Single document web server]]
-  * [[read_password_without_echo]]
+  * [[Read password without echo]]
+  * [[Amazon preview leech]]
-====== blobs of code ======
+====== Blobs of code ======
 <code perl>
@@ Line 24: / Line 26: @@
 sub sum { my $r=0; for (@_) { $r += $_ }; return $r; }
 sub avg { return sum(@_)/@_; }
+sub stdev {
+	my $s=0;
+	my $avg = avg(@_);
+	foreach (@_){
+		$s += ($_ - $avg)**2;
+	}
+	return sqrt($s/(@_-1));
+}
 sub limits {
 	my $lo = my $hi = $_[0];
@@ Line 67: / Line 77: @@
 		'<undefined timestamp format>';
 }
+sub size_units {
+	my ($n) = @_;
+	if ($n>1024*1024*1024*1024) { return sprintf("%.1f T",$n/(1024*1024*1024*1024)); }
+	if ($n>     1024*1024*1024) { return sprintf("%.1f G",$n/(     1024*1024*1024)); }
+	if ($n>          1024*1024) { return sprintf("%.1f M",$n/(          1024*1024)); }
+	if ($n>               1024) { return sprintf("%.1f k",$n/(               1024)); }
+	return $n;
+}
+sub parse_size_units {
+	my ($s) = @_;
+	if ($s=~/^([.\d]+)([kmgt]?)$/i) {
+		if    ($2 eq 't' || $2 eq 'T') { return $1*1024*1024*1024*1024; }
+		elsif ($2 eq 'g' || $2 eq 'G') { return $1*1024*1024*1024; }
+		elsif ($2 eq 'm' || $2 eq 'M') { return $1*1024*1024; }
+		elsif ($2 eq 'k' || $2 eq 'K') { return $1*1024; }
+		else                           { return $1; }
+	} else {
+		return undef;
+	}
+}