X-Git-Url: http://git.shiar.nl/barcat.git/blobdiff_plain/e8e86ee4ef87d10f2ec46c09f2c7ccd51adb0cb2..67f0129e0e80e700854f499eb459a18e7c03524e:/barcat

diff --git a/barcat b/barcat
index 9c4741a..d3ba821 100755
--- a/barcat
+++ b/barcat
@@ -315,15 +315,15 @@ Draw a sine wave:
 
     seq 30 | awk '{print sin($1/10)}' | barcat
 
-Compare file sizes:
+Compare file sizes (with human-readable numbers):
 
-    du -d0 -m * | barcat
+    du -d0 -b * | barcat -H
 
-Memory usage of user processes:
+Memory usage of user processes with long names truncated:
 
     ps xo %mem,pid,cmd | barcat -l40
 
-Monitor network latency:
+Monitor network latency from prefixed results:
 
     ping google.com | barcat -f'time=\K' -t
 
@@ -334,14 +334,14 @@ Commonly used after counting, for example users on the current server:
 Letter frequencies in text files:
 
     cat /usr/share/games/fortunes/*.u8 |
-    perl -CO -nE 'say for grep length, split /\PL*/, uc' |
+    perl -CS -nE 'say for grep length, split /\PL*/, uc' |
     sort | uniq -c | barcat
 
 Number of HTTP requests per day:
 
     cat log/access.log | cut -d\  -f4 | cut -d: -f1 | uniq -c | barcat
 
-Any kind of database query with leading counts:
+Any kind of database query with counts, preserving returned alignment:
 
     echo 'SELECT count(*),schemaname FROM pg_tables GROUP BY 2' |
     psql -t | barcat -u
@@ -349,7 +349,10 @@ Any kind of database query with leading counts:
 External datasets, like movies per year:
 
     curl https://github.com/prust/wikipedia-movie-data/raw/master/movies.json |
-    jq '.[].year' | uniq -c | barcat
+    perl -054 -nlE 'say if s/^"year"://' | uniq -c | barcat
+
+But please get I<jq> to process JSON
+and replace the manual selection by C<< jq '.[].year' >>.
 
 Pokémon height comparison: