The Knowlege base arranges tips and userful informations scattered on the web.
For more information, take a look to the introduction
Bash scripting is very easy to setup. So we end up using it all the time for simple procedural script. Sometimes is it useful to have idempotent script, like Ansible and Saltstack teach use, this script should only do an action if needed. Some tima ago, I have the need to convert a bunch of …
I’d like to point you to this blog article about “cycle stepped” 6502 emulator. It is well described and can be a neat read for xmas vacation. Also author’s main project is all about A toolbox of 8-bit chip-emulators, helper code and complete embeddable system emulators in dependency-free C headers (a subset of C99 that …
Suppose you are developing a boring Jenkins pipline (like Jenkinsfile-s) with no time at all. You are forced to commit and then run the jenkins pipeline. Jenkins download the code from your LOCAL repository. To avoid commit& push roundtrip you are using the simple git daemon command to expose your local repository to jenkins. So …
Some co-workers started using Apache Kafka con a bunch of our Customers. Apache Kafka is a community distributed event streaming platform capable of handling trillions of events a day. Initially conceived as a messaging queue, Kafka is based on an abstraction of a distributed commit log[*]. To get this goal, Apache Kafka needs a complex …
Use docker in docker to drive docker from a container Working under windows, sometimes docker slow down. Sometimes you need to access to the MobyVM. With this line: docker run –rm -ti -v “/var/run/docker.sock:/var/run/docker.sock” -v /:/host docker sh you run a container which will removed upon exit. This container can access to docker daemon (via …
Ring – Cache interface as a programming language integrationRing provides function-oriented cache interface for various backends. Repository: https://github.com/youknowone/ring/ Source: Ring – Cache interface as a programming language integration — Ring 0.7.2 documentation
https://asciinema.org/
isync: free IMAP and MailDir mailbox synchronizerisync is a command line application which synchronizes mailboxes; currently Maildir and IMAP4 mailboxes are supported. New messages, message deletions and flag changes can be propagated both ways. isync is suitable for use in IMAP-disconnected mode.Synchronization is based on unique message identifiers (UIDs), so no identification conflicts can occur …
isync: free IMAP and MailDir mailbox synchronizer Read More »
On these days I decided to tune a bit my new shiny linux server box. I started to set up fail2ban. I think fail2ban is very imporant nowadays because it is a good example of a tool for slowing down attacks without closing your server too much. Fail2ban is a daemon: it wll monitor your …
To understand Angular 4, after the “Hero” tutorial you should start from the Template syntax. We highlighted some statement in red below: Data direction Syntax Type One-way from data source to view target {{expression}} [target]=”expression” bind-target=”expression” Interpolation Property Attribute Class Style One-way from view target to data source (target)=”statement” on-target=”statement” Event Two-way [(target)]=”expression” bindon-target=”expression” Two-way …
Ci sono una nuova generazione di “nullasapienti”, persone che con una inutile laurea (tipicamente in legge) diventano giornalisti dilettanti, seguono i trend della “blogosfera” e leggono magari qualche bel libro di comunicazione. Il risultato è che pubblicano video che non sono scontati, non sono banali ma non sono neppure perle di saggezza. Sono ovvi. La …
Arduino is a great hardware for a lot of reason: easy to use, difficulto to break, it is a very solid 5-Volt board. But it a way too much and it has a very limited amount of RAM. So I started exploring other more “different” solutions. I need an economy chip with some RAM …
Sometimes you need to remove nasty duplicate on a table, based on a subset of the column. On every big database there is something called “rowid” which can be used to indentify a column in a unique way. On PostgreSQL is called ctid, as we shall see: Oracle way: DELETE FROM your_table WHERE rowid not …
Removing duplicate rows in PostgreSQL, Oracle and SQLite Read More »
In Excel you can easily fill in a column with a list of values. Some times also in Emacs you my need to write down a bunch of similar code. The dotimes function with the “elsp eval” M-x : (Esc + : on windooze) will solve your trouble easily. Try out this code on scratch …
On some environment, on some customers, Oracle connections are drop after some idle time (i.e. 2 minutes). I have found a small plugin for Sql Developer to solve this issue: it is very handy and logs its usage. Code is also very clean https://github.com/scristalli/sql-developer-keepalive 13 forks. 90 stars. 1 open issues. Recent commits: Update CHANGELOG, GitHub …
