Pareri

Posted on by Diego

Crock: “Che ti succede, D’Angelo?”
Legionario: “Il dottore mi ha detto che sto male per troppo bere e troppe donne”
Crock: “Dovresti chiedere un altro parere”
Legionario: “Perchè? …mi è piaciuto il primo”

“Crock” di Bill Rechin & Don Wilder
Linus
luglio 1991

Mancio

Posted on by Diego

Mancini, sei veramente un grande! In barba a etichetta e “finto” bon ton, dici davvero quello che pensi!
BRAVO MANCIO, falli neri!

(in riferimento alle dichiarazioni fatte a Italia1 il 10/2/08 alle 22.50)

crontab -e: I can’t use the default editor!

Posted on by Diego

Usually we use crontab -e command, while logged in as a user, to modify the user’s cron jobs or crontab -e -u[user] as root.

The editor used fot this depends on the system variable VISUAL or EDITOR (if present) else the default editor will be used /usr/bin/editor.

So if the default editor is a not well known program (take “VI” as an example, even if you use the more user friendly “VIM”…), you can modify the suggested system variables if present, to verify:

set | grep -iE ‘(visual)|(editor)’

grep, cut, awk, sort, uniq… linux shell power!

Posted on by Diego

How powerful can be linux shell? This is just an other nice example of the power of linux shell!

Well, this is the game: suppose to need on a remote machine to count how many times an ip address (or user or whatever you want) is used in a log file or a part of it.

Let’s take a sample log: Apache access log.

The format is something like (see attached example log file):
1.1.1.1 – – [16/Jan/2008:22:18:42 +0100] “GET /dir/pag.htm” 200 11 “http://diegobelotti.com/a.php” “Mozilla 5 (Windows..) Firefox”