How do I use docker command's "--format" option?

I can't seem to find any good documentation on how to use the docker command's "--format" option in real life. I know how to use Go templates. But specific to docker, how do I know what placeholders are available to use?

I tried docker inspect on a container and I see JSON output, but I can't use the names from that as Go template placeholders. I did find out that the placeholders are case-sensitive, which seems unfortunate. The default output isn't much help either, since (I assume) it isn't showing me everything I might use, the columns that are there are all uppercase, and they sometimes have spaces in them. docker container ls, for example, has a column called "CONTAINER ID". No combination of underscores, quoting schemes, or so on will make that name work. I figured out that it's "{{.ID}}".

How am I supposed to be using "--format"? How do I discover placeholders for any given docker object?

I take the risk of being downvoted here, but I find Go templates a nightmare to use beyond the most basic use cases. Don't take me wrong: they are extremely powerful as you can guess it by reading the docs, but I find the syntax unfriendly, and for the most complex cases, I prefer parsing the JSON output with jq. Anyway:

Formatting expect commands

```
sho$ CID=$(sudo docker run --rm -d busybox sleep 3000)
sh$ sudo docker inspect $CID
[
{
"Id": "0470a3549d2f41efd0477cf8fc4eb3a27aca592f089c018ad24704031bbef967",
"Created": "2019-02-05T16:41:40.040349047Z",
"Path": "sleep",
"Args": [
"3000"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 26467,
"ExitCode": 0,
"Error": "",
"StartedAt": "2019-02-05T16:41:40.659056612Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:3a093384ac306cbac30b67f1585e12b30ab1a899374dabc3170b9bca246f1444",
"ResolvConfPath": "/var/lib/docker/containers/0470a3549d2f41efd0477cf8fc4eb3a27aca592f089c018ad24704031bbef967/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/0470a3549d2f41efd0477cf8fc4eb3a27aca592f089c018ad24704031bbef967/hostname",
"HostsPath": "/var/lib/docker/containers/0470a3549d2f41efd0477cf8fc4eb3a27aca592f089c018ad24704031bbef967/hosts",
"LogPath": "/var/lib/docker/containers/0470a3549d2f41efd0477cf8fc4eb3a27aca592f089c018ad24704031bbef967/0470a3549d2f41efd0477cf8fc4eb3a27aca592f089c018ad24704031bbef967-json.log",
"Name": "/vibrant_shaw",
"RestartCount": 0,
"Driver": "aufs",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "docker-default",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": true,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "shareable",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DiskQuota": 0,
"KernelMemory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware"
],
"ReadonlyPaths": [
"/proc/asound",
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": null,
"Name": "aufs"
},
"Mounts": [],
"Config": {
"Hostname": "0470a3549d2f",
"Domainn

StackExchange DevOps Q#6241, answer score: 30