s/^\h*// unless $opt{unmodified};
push @values, s/$valmatch/\n/ && $1;
push @order, $1 if length $1;
- if (defined $opt{trim}) {
+ if (defined $opt{trim} and defined $1) {
my $trimpos = abs $opt{trim};
if ($trimpos <= 1) {
$_ = substr $_, 0, 1;
$opt{hidemax} ||= @lines;
printf '%s of ', sum(@values[$opt{hidemin} - 1 .. $opt{hidemax} - 1]) // 0;
}
- my $total = sum @order;
- printf '%s total', $total;
- printf ' in %d values', scalar @values;
- printf ' (%s min, %*.*f avg, %s max)',
- $order[-1], 0, 2, $total / @order, $order[0];
+ if (@order) {
+ my $total = sum @order;
+ printf '%s total', $total;
+ printf ' in %d values', scalar @values;
+ printf ' (%s min, %*.*f avg, %s max)',
+ $order[-1], 0, 2, $total / @order, $order[0];
+ }
say '';
}
=head1 EXAMPLES
-Commonly used after counting, such as users on the current server:
+Draw a sine wave:
- users | sed 's/ /\n/g' | sort | uniq -c | barcat
+ seq 30 | awk '{print sin($1/10)}' | barcat
-Letter frequencies in text files:
+Compare file sizes:
- cat /usr/share/games/fortunes/*.u8 |
- perl -CO -nE 'say for grep length, split /\PL*/, uc' |
- sort | uniq -c | barcat
+ du -d0 -m * | barcat
Memory usage of user processes:
ps xo %mem,pid,cmd | barcat -l40
-Sizes (in megabytes) of all root files and directories:
+Monitor network latency:
- du -d0 -m * | barcat
+ ping google.com | barcat -f'time=\K' -t
+
+Commonly used after counting, for example users on the current server:
+
+ users | sed 's/ /\n/g' | sort | uniq -c | barcat
+
+Letter frequencies in text files:
+
+ cat /usr/share/games/fortunes/*.u8 |
+ perl -CS -nE 'say for grep length, split /\PL*/, uc' |
+ sort | uniq -c | barcat
Number of HTTP requests per day:
echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
psql -t | barcat -u
-Exchange rate USD/EUR history from CSV download provided by ECB:
+External datasets, like movies per year:
+
+ curl https://github.com/prust/wikipedia-movie-data/raw/master/movies.json |
+ jq '.[].year' | uniq -c | barcat
+
+Pokémon height comparison:
+
+ curl https://github.com/Biuni/PokemonGO-Pokedex/raw/master/pokedex.json |
+ jq -r '.pokemon[] | [.height,.num,.name] | join(" ")' | barcat
+
+USD/EUR exchange rate from CSV provided by the ECB:
curl https://sdw.ecb.europa.eu/export.do \
-Gd 'node=SEARCHRESULTS&q=EXR.D.USD.EUR.SP00.A&exportType=csv' |
grep '^[12]' | barcat -f',\K' --value-length=7
Total population history from the World Bank dataset (XML):
+External datasets, like total population in XML from the World Bank:
curl http://api.worldbank.org/v2/country/1W/indicator/SP.POP.TOTL |
xmllint --xpath '//*[local-name()="date" or local-name()="value"]' - |
sed -r 's,</wb:value>,\n,g; s,(<[^>]+>)+, ,g' | barcat -f1 -H
-Movies per year from prepared JSON data:
-
- curl https://github.com/prust/wikipedia-movie-data/raw/master/movies.json |
- jq '.[].year' | uniq -c | barcat
-
-Pokémon height comparison:
-
- curl https://github.com/Biuni/PokemonGO-Pokedex/raw/master/pokedex.json |
- jq -r '.pokemon[] | [.height,.num,.name] | join(" ")' | barcat
-
-Git statistics, such commit count by year:
+And of course various Git statistics, such commit count by year:
git log --pretty=%ci | cut -b-4 | uniq -c | barcat
git shortlog -sn | barcat -L3 -s
-Latency history:
-
- ping google.com | barcat -f'time=\K' -t
-
=head1 AUTHOR
Mischa POSLAWSKY <perl@shiar.org>