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string $sel[] = `ls -sl`; // this is one of the most used lines when mel scripting
string $node = `createNode distanceBetween`; // basic node creator, result as node's name stored in $node variable
$sel = `listRelavtives -c $sel[0]`; // if your selection was a camera's transform this line will get its childs so you can get its camera node
connectAttr -f ($node + ".distance") ($sel[0] + ".octFocalDepth"); // connection...

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global proc myScriptName()
{
    //...code...
}

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/*global proc CameraFocus()
{
*/

//camera selected
string $Camera[] = `ls -sl`;

//UI for name selection
string $namequery = `promptDialog  -title "Camera Focus"
                              -message "Please enter a base name for the Camera Focus rig:"
                              -text "CameraFocus"
                              -button "OK"
                              -button "Cancel"
                              -defaultButton "OK"`;

string $name = `promptDialog -q`;


// the distanceBetween Node 
string $Distance = `createNode distanceBetween -n ($name + "_distanceShape#")`;

// the camera locator
createNode locator -n ($name + "_EyeShape#");
string $Campoint[] = `ls -sl`;

// the focus locator in yellow
createNode locator -n ($name + "_FocusShape#");
scale -yz 1.5 1;
setAttr ".overrideEnabled" 1;
setAttr ".overrideColor" 6;
colorIndex 6 1 1 0;
color -ud 6;
string $FocPoint[] = `ls -sl`;
move -rpr 0 0 -2 ;

// distance connections
connectAttr -f ($Campoint[0] + ".worldPosition") ($Distance + ".point1");
connectAttr -f ($FocPoint[0] + ".worldPosition") ($Distance + ".point2");

// bug fixed to prepare for the xform
select -r $Camera;
rename $name;
string $newCamera[] = `ls -sl`;

// moves the camera locator at the camera position
float $position[3] = `xform -worldSpace -query -translation $newCamera`;
select -r $Campoint;
move -p -ws $position[0] $position[1] $position[2];

// freezes, parents and hides the camera locator
select $Campoint;
select -add $newCamera;
parent;
setAttr -lock true ($Campoint[1] + ".tx");
setAttr -lock true ($Campoint[1] + ".ty");
setAttr -lock true ($Campoint[1] + ".tz");
setAttr -lock true ($Campoint[1] + ".rx");
setAttr -lock true ($Campoint[1] + ".ry");
setAttr -lock true ($Campoint[1] + ".rz");
setAttr -lock true ($Campoint[1] + ".sx");
setAttr -lock true ($Campoint[1] + ".sy");
setAttr -lock true ($Campoint[1] + ".sz");
HideSelectedObjects;

// connect to your favorite renderer
connectAttr -f ($Distance + ".distance") ($newCamera[0] + ".focusDistance");
connectAttr -f ($Distance + ".distance") ($newCamera[0] + ".octFocalDepth");

/*
}

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if (`attributeExists ".octFocalDepth" $newCamera[0]`)