From d11dfbdb5dbe0ea133e144c0edb63ff8d48a6330 Mon Sep 17 00:00:00 2001 From: Mischa POSLAWSKY Date: Wed, 4 Sep 2019 20:21:24 +0200 Subject: [PATCH] document practical example oneliners Some shell commands adapted from personal history. After pictures, code should also be worth quite some words. --- graph | 39 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 37 insertions(+), 2 deletions(-) diff --git a/graph b/graph index f9d18a9..5b61e53 100755 --- a/graph +++ b/graph @@ -52,8 +52,6 @@ graph - append bar chart to input numbers B [] [] -cat ... | uniq -c | graph - =head1 DESCRIPTION Each line starting with a number is given a bar to visualise relative sizes. @@ -69,6 +67,43 @@ Appended graphics will extend to fill up the entire screen. =back +=head1 EXAMPLES + +Commonly used after counting, such as users on the current server: + + users | sed 's/ /\n/g' | sort | uniq -c | graph + +Letter frequencies in text files: + + cat /usr/share/games/fortunes/*.u8 | + perl -CO -nE 'say for grep length, split /\PL*/, uc' | + sort | uniq -c | graph + +Memory usage of user processes: + + ps xo %mem,pid,cmd | graph -l40 + +Sizes (in megabytes) of all root files and directories: + + du -d0 -m * | graph + +Number of HTTP requests per day: + + cat log/access.log | cut -d\ -f4 | cut -d: -f1 | uniq -c | graph + +Any kind of database query with leading counts: + + echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' | + psql -t | graph + +Git statistics, such commit count by year: + + git log --pretty=%ci | cut -b-4 | uniq -c | graph + +Or the most frequent authors: + + git shortlog -sn | graph | head -3 + =head1 AUTHOR Mischa POSLAWSKY -- 2.30.0