Lancer un script au démarrage

Pour lancer un script au démarrage du système “proprement” (en utilisant systemd) :

1. créer un script et le placer dans /usr/local/bin.

2. créer un fichier de configuration dans /etc/systemd/system/xxx.service

3. Y placer le contenu suivant :

[Unit]
Description=Bypass Dell fan control
Before=i8kmon.service

[Service]
ExecStart=/usr/local/bin/dell-bios-fan-control enable=1
Type=oneshot
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

4. Lancer systemctl daemon-reload

5. Activer le service avec systemctl enable xxx.service

La doc : https://www.freedesktop.org/software/systemd/man/systemd.unit.html#Before=

Bullshit sites

Il y a parfois des sites qui valent le détour tant le n’importe quoi est poussé à son paroxysme. Florilège.

Okinaha – Le charlatanisme 2.0 – Ne vous contentez pas de cette page d’introduction, le site regorge d’attrape-nigauds pour personnes électrosensibles.
https://okinaha.com/collections/hygiene-electromagnetique/products/genatome-gtc-369-bouclier-electromagnetique-1

Répondeur courier-mta avec maildrop et mailbot

Il faut d’abord indiquer à courier d’utiliser un autre MDA (Mail Distribution Agent) :

/home/vmail/account/.courier :
|/usr/bin/maildrop .mailfilter

Puis indiquer les règles dans /home/vmail/account/.mailfilter :

cc "!joe@gosane.fr"
cc "| mailbot -A \"From: Account <account@gosane.fr>\" \
-N -c utf8 -T reply \
-s \"I'm on vacation\" \
-t 'vacation.txt' \
/usr/sbin/sendmail -f ''"
to "./Maildir"

Il faudra un fichier vacation.txt dans /home/vmail/account.

Raw SQL in Ruby/Rails

Everyone seems to discourage the use of raw SQL in Ruby applications and while ActiveRecord seems a good solution for general purpose CRUD operations, we have a strong expertise in SQL and we want to use it as much as possible. Here are the bits we have collected so far on the subject. We are new to Ruby/Rails so these might be obvious for some of you. We primarily write this for ourselves.

We are perfectly aware of the “limitations”. We love PostgreSQL and have no intention of being RDBMS-agnostic. At all.

find_by_sql the way we want it

We want named parameters because, despite the overhead, it’s the cleanest way to pass parameters (we don’t have to preserve a strict order which can lead to problems when enhancing the query, counting the “?”, etc). Also, when we use the same parameter several times in the same query, we don’t have to repeat it.

class ClientsController < ApplicationController

	def index
		@clients = Client.find_by_sql(
			<<-SQL
			SELECT idclient,name,email,contacts
			FROM clients 
			ORDER BY nom
			SQL
			)
	end

	def show
		@client = Client.find_by_sql(["	
			SELECT idclient,name,email,contacts 
			FROM clients 
			WHERE idclient = :idclient", 
			{ :idclient => params[:id] } 
		])[0]
	end

For the show method, we have to grab the first element in the array (thus the [0]at the end.

TdxSpreadSheet creation and filling via code

Basic usage and formatting

procedure TForm1.b1Click(Sender: TObject);
Var xls:TdxSpreadSheet;
    sh: TdxSpreadSheetTableView;
begin
  xls:=TdxSpreadSheet.Create(Self);
  Try
    xls.BeginUpdate;
    xls.ClearAll;
    sh:=TdxSpreadSheetTableView(xls.AddSheet('Bénéficiaires'));

    // row,col
    if Cells[1,1]=Nil then
      CreateCell(1,1);
    Cells[Row,Col].AsString:='test';
    sh.cells[1,1].Style.Borders[bLeft].Style:=sscbsDouble;
    sh.cells[1,1].Style.Borders[bRight].Color:=clred;
    sh.Cells[1,1].Style.Brush.BackgroundColor:=clcxLightGray;
    sh.Cells[1,1].Style.AlignHorz:=ssahCenter;
    sh.Cells[1,1].Style.DataFormat.FormatCode:='dd/mm/yyyy';
    sh.Cells[1,1].Style.DataFormat.FormatCode:='# ##0.00';
    sh.Cells[1,1].Style.Font.Style:=[fsBold];

    // Formula
    CreateCell(2,1); // B3
    sh.Cells[2,1].SetText('=SUM(B2:B2)',true);

    xls.EndUpdate;
    xls.SaveToFile('C:\Users\gosane\Desktop\text.xlsx');
  Finally
    xls.Free;
  End;
end;

Helpers

function xlscolname(i:integer):string;
var a,b:integer;
begin
  if i<0 then
    result:='?'
  else if i<26 then
    result:=chr(65+i)
  else begin
    a:=i div 26;
    b:=i mod 26;
    result:=chr(64+a)+chr(65+b);
  end;
end;

Working with TPgDAC (DevArt components for Delphi)

TPgLoader

interface uses DALoader,PgLoader;

Type TMyForm = Class(TForm)
       // ...
       private
         procedure PgLoader1PutData(Sender: TDALoader);
     End;

{...}

procedure TFxxx.PgLoader1PutData(Sender: TDALoader);
var i:Integer;
begin
  for i:=1 to 10 do
    Sender.PutColumnData('fieldname',i,Value);
end;


procedure TFxxx.Import;
Var pgl:TPgLoader;
begin
  pgl:=TPgLoader.Create(Application);
  Try
    pgl.Connection:=DM.PgConnection1;
    pgl.TableName:='MyTableName';
    pgl.Options.BufferSize:=65536;
    // pgl.OnProgress:=LoaderProgress;
    pgl.OnPutData:=PgLoader1PutData;
    pgl.CreateColumns;
    // Remove primary key from PgLoader
    for I := 0 to pgl.Columns.Count-1 do
      if pgl.Columns[i].Name='idprimarykey' then begin
        pgl.Columns.Delete(i);
        break;
      end;
    pgl.Load;
  Finally
    pgl.Free;
  End;
end;

KDE5 – Hints and tips

Autostarting applications

Plasma can autostart applications and run scripts on startup and shutdown. To autostart an application, navigate to System Settings > Startup and Shutdown > Autostart and add the program or shell script of your choice. For applications, a .desktop file will be created, for shell scripts, a symlink will be created.

Note:

Programs can be autostarted on login only, whilst shell scripts can also be run on shutdown or even before Plasma itself starts.
Shell scripts will only be run if they are marked executable.

Place Desktop entries (i.e. .desktop files) here:

~/.config/autostart : for starting applications at login.

Place or symlink shell scripts in one of the following directories:

~/.config/plasma-workspace/env : for executing scripts at login before launching Plasma.

~/.config/autostart-scripts : for executing scripts at login.

~/.config/plasma-workspace/shutdown : for executing scripts on shutdown.

Source : https://wiki.archlinux.org/index.php/KDE#Autostarting_applications

SSL, Certificats…

Obtenir des infos

Un résumé utile :

openssl x509 -noout -dates -subject -in moncertif.crt

La totale :

openssl x509 -noout -text -in moncertif.crt

Générer une chaîne pour courier-mta

cat moncert.crt intermediaire.crt moncert.key >/etc/courier/moncert.pem
  • Ne pas oublier de régler les droits à 600 et de donner le fichier à daemon
  • Regarder dans mail.log et pas seulement mail.err
  • Redémarrer courier-mta-ssl

Astuces Delphi

Déclencher une action au démarrage de l’application

procedure TFMain.FormShow(Sender: TObject);
begin
  PostMessage(Button1.Handle,WM_LBUTTONDOWN,0,0);
  PostMessage(Button1.Handle,WM_LBUTTONUP,0,0);
end;

Créer des listes d’objets avec TObjectList

uses Contnrs;

Dans l’interface :

TSQLColumn = Class
  name     : string;
  typ      : string;
  // ...autres champs...
End;
TSqlColumnList = class(TObjectList)
  private
    function GetItem(Index: Integer): TSQLColumn;
    procedure SetItem(Index: Integer; const Value: TSQLColumn);
  public
    property Items[Index: Integer]: TSQLColumn read GetItem write SetItem; default;
end;

Dans l’implémentation :

{ TSqlColumnList }

function TSqlColumnList.GetItem(Index: Integer): TSQLColumn;
begin
  Result:=TSqlColumn(inherited GetItem(Index));
end;

procedure TSqlColumnList.SetItem(Index: Integer; const Value: TSQLColumn);
begin
  inherited setItem(index, value);
end;

Utilisation :

TMyClass = Class
  FColumns        : TSqlColumnList;
  Constructor Create;
  Destructor Destroy; reintroduce;
End;

{ TcatRequete }

constructor TcatRequete.Create;
begin
  FColumns := TSqlColumnList.Create;
end;

destructor TcatRequete.Destroy;
begin
  FColumns.Free;
end;

Et pour remplir la liste :

Var column : TSqlColumn;
begin
  FColumns.Clear;
  // Ajouter un élément
  column:=TSqlColumn.Create;
  FColumns.Add(Column);
  With column do begin
    name := 'xxx';
  end;
end;