azure - How to escape single quote in ARM template

Question

Given the following resource in an AzureRM template, how would one encode the single quote in the commandToExecute part?

{
  "type": "Microsoft.Compute/virtualMachines/extensions",
  "name": "[concat(variables('vmNameMaster'), copyIndex(), '/sethost')]",
  "apiVersion": "2015-06-15",
  "location": "[resourceGroup().location]",
  "copy": {
      "name": "extensionLoopNode",
      "count": "[variables('masterCount')]"
  },
  "dependsOn": [
      "[concat('Microsoft.Compute/virtualMachines/', variables('vmNameMaster'), copyIndex(),'/extensions/DockerExtension')]"
  ],
  "properties": {
    "publisher": "Microsoft.OSTCExtensions",
    "type": "CustomScriptForLinux",
    "typeHandlerVersion": "1.4",
    "settings": {
      "fileUris": [ ],
      "commandToExecute": "[concat('/bin/bash -c 'echo "export DOCKER_HOST=:2375" >> /home/', parameters('adminUsername') ,'/.profile'')]",
      "timestamp": 123456789
    }
  }
},

Answer 1

You escape Azure ARM functions in the same way as with VB strings: you simply double the single quote characters.

[concat('This is a ''quoted'' word.')]

outputs

This is a 'quoted' word.

---

Double quotes still needs to be escaped from JSON.

 [concat('''single'' and "double" quotes.')]

outputs

'single' and "double" quotes.