Script demonstrating % issue

gistfile1.txt

#!/usr/bin/env bash
set -euo pipefail

PROJECT_ID="MY_PROJECT_ID"
LOCATION="us-central1"
BUCKET="gs://my-bucket"

# Autogenerate job name with timestamp + random
JOB_NAME="job-$(date +%Y%m%d-%H%M%S)-$RANDOM"

gcloud beta batch jobs submit "$JOB_NAME" \
  --location "$LOCATION" \
  --config - <<EOD
{
  "name": "projects/${PROJECT_ID}/locations/${LOCATION}/jobs/${JOB_NAME}",
  "taskGroups": [
    {
      "taskCount": "1",
      "parallelism": "1",
      "taskSpec": {
        "computeResource": {
          "cpuMilli": "1000",
          "memoryMib": "512"
        },
        "runnables": [
          {
            "container": {
              "imageUri": "gcr.io/google.com/cloudsdktool/cloud-sdk:294.0.0-slim",
              "volumes": "/mnt/disks/data:/mnt/data",
              "entrypoint": "/bin/bash",
              "commands": [
                "-c",
                "mkdir -p /mnt/data/.logging && echo \"%hel%lo%\" && sleep 10 && gsutil cp /mnt/data/.logging/stdout*.log ${BUCKET}/stdout.txt"
              ]
            }
          }
        ],
        "volumes": []
      }
    }
  ],
  "allocationPolicy": {
    "network": {
       "networkInterfaces": [
        {
          "network": "projects/${PROJECT_ID}/global/networks/default",
          "subnetwork": "projects/${PROJECT_ID}/regions/us-central1/subnetworks/default",
          "noExternalIpAddress": true
        }
      ]
    },
    "instances": [
      {
        "policy": {
          "provisioningModel": "STANDARD",
          "machineType": "e2-medium"
        }
      }
    ]
  },
  "logsPolicy": {
    "destination": "PATH",
    "logsPath": "/mnt/disks/data/.logging/"
  }
}
EOD