# Swap usage:
swapon --bytes --show=SIZE,USED | tail +2
returns:
32767995904 786432

# list of blocks:
lsblk -f
#Output:
NAME   FSTYPE FSVER LABEL            UUID                                 FSAVAIL FSUSE% MOUNTPOINTS
sda
├─sda1 vfat   FAT32                  15F4-E10D                             504,8M     1% /boot/efi
├─sda2 ext4   1.0                    e0443689-0a6e-40eb-83b2-ffb277b3d5f3     26G    48% /
├─sda3 ext4   1.0                    d81e9146-8f33-4ee7-99f4-ccc2d5223fc4  145,3G    77% /home
└─sda4 swap   1                      167dbcd0-bbde-4874-958c-33de48952af2                [SWAP]
sdb
└─sdb1 ext4   1.0   5TB_easyStroreSV d81e7a8f-9a5f-479e-8907-39e20cc735f0      2T    50% /mnt/usb-WD_5TB_SVG

# list of blocks in JSON format:
lsblk -J
#Output:
{
   "blockdevices": [
      {
         "name": "sda",
         "maj:min": "8:0",
         "rm": false,
         "size": "931,5G",
         "ro": false,
         "type": "disk",
         "mountpoints": [
             null
         ],
         "children": [
            {
               "name": "sda1",
               "maj:min": "8:1",
               "rm": false,
               "size": "512M",
               "ro": false,
               "type": "part",
               "mountpoints": [
                   "/boot/efi"
               ]
            },{
               "name": "sda2",
               "maj:min": "8:2",
               "rm": false,
               "size": "57,2G",
               "ro": false,
               "type": "part",
               "mountpoints": [
                   "/"
               ]
            },{
               "name": "sda3",
               "maj:min": "8:3",
               "rm": false,
               "size": "843,3G",
               "ro": false,
               "type": "part",
               "mountpoints": [
                   "/home"
               ]
            },{
               "name": "sda4",
               "maj:min": "8:4",
               "rm": false,
               "size": "30,5G",
               "ro": false,
               "type": "part",
               "mountpoints": [
                   "[SWAP]"
               ]
            }
         ]
      },{
         "name": "sdb",
         "maj:min": "8:16",
         "rm": false,
         "size": "4,5T",
         "ro": false,
         "type": "disk",
         "mountpoints": [
             null
         ],
         "children": [
            {
               "name": "sdb1",
               "maj:min": "8:17",
               "rm": false,
               "size": "4,5T",
               "ro": false,
               "type": "part",
               "mountpoints": [
                   "/mnt/usb-WD_5TB_SVG"
               ]
            }
         ]
      }
   ]
}

lsblk -A -b -f -t -J
#Output:
{
   "blockdevices": [
      {
         "name": "sda",
         "fstype": null,
         "fsver": null,
         "label": null,
         "uuid": null,
         "fsavail": null,
         "fsuse%": null,
         "mountpoints": [
             null
         ],
         "alignment": 0,
         "min-io": 4096,
         "opt-io": 0,
         "phy-sec": 4096,
         "log-sec": 512,
         "rota": true,
         "sched": "mq-deadline",
         "rq-size": 2,
         "ra": 128,
         "wsame": 0,
         "children": [
            {
               "name": "sda1",
               "fstype": "ext4",
               "fsver": "1.0",
               "label": "5TB_easyStroreSV",
               "uuid": "d81e7a8f-9a5f-479e-8907-39e20cc735f0",
               "fsavail": 2166849302528,
               "fsuse%": "51%",
               "mountpoints": [
                   "/mnt/usb-WD_5TB_SVG"
               ],
               "alignment": 0,
               "min-io": 4096,
               "opt-io": 0,
               "phy-sec": 4096,
               "log-sec": 512,
               "rota": true,
               "sched": "mq-deadline",
               "rq-size": 2,
               "ra": 128,
               "wsame": 0
            }
         ]
      },{
         "name": "nvme1n1",
         "fstype": null,
         "fsver": null,
         "label": null,
         "uuid": null,
         "fsavail": null,
         "fsuse%": null,
         "mountpoints": [
             null
         ],
         "alignment": 0,
         "min-io": 512,
         "opt-io": 0,
         "phy-sec": 512,
         "log-sec": 512,
         "rota": false,
         "sched": "none",
         "rq-size": 1023,
         "ra": 128,
         "wsame": 0,
         "children": [
            {
               "name": "nvme1n1p1",
               "fstype": "ext4",
               "fsver": "1.0",
               "label": null,
               "uuid": "b658c94a-b41b-466d-9571-6b0b56957f4b",
               "fsavail": 268734427136,
               "fsuse%": "68%",
               "mountpoints": [
                   "/home"
               ],
               "alignment": 0,
               "min-io": 512,
               "opt-io": 0,
               "phy-sec": 512,
               "log-sec": 512,
               "rota": false,
               "sched": "none",
               "rq-size": 1023,
               "ra": 128,
               "wsame": 0
            }
         ]
      },{
         "name": "nvme0n1",
         "fstype": null,
         "fsver": null,
         "label": null,
         "uuid": null,
         "fsavail": null,
         "fsuse%": null,
         "mountpoints": [
             null
         ],
         "alignment": 0,
         "min-io": 512,
         "opt-io": 0,
         "phy-sec": 512,
         "log-sec": 512,
         "rota": false,
         "sched": "none",
         "rq-size": 1023,
         "ra": 128,
         "wsame": 0,
         "children": [
            {
               "name": "nvme0n1p1",
               "fstype": "vfat",
               "fsver": "FAT32",
               "label": null,
               "uuid": "111B-FC5F",
               "fsavail": 529371136,
               "fsuse%": "1%",
               "mountpoints": [
                   "/boot/efi"
               ],
               "alignment": 0,
               "min-io": 512,
               "opt-io": 0,
               "phy-sec": 512,
               "log-sec": 512,
               "rota": false,
               "sched": "none",
               "rq-size": 1023,
               "ra": 128,
               "wsame": 0
            },{
               "name": "nvme0n1p2",
               "fstype": "ext4",
               "fsver": "1.0",
               "label": null,
               "uuid": "1c056b86-d21c-4eb7-9de3-547c2a7ea907",
               "fsavail": 179800453120,
               "fsuse%": "10%",
               "mountpoints": [
                   "/"
               ],
               "alignment": 0,
               "min-io": 512,
               "opt-io": 0,
               "phy-sec": 512,
               "log-sec": 512,
               "rota": false,
               "sched": "none",
               "rq-size": 1023,
               "ra": 128,
               "wsame": 0
            },{
               "name": "nvme0n1p3",
               "fstype": "swap",
               "fsver": "1",
               "label": null,
               "uuid": "cd8e5342-7f19-48b8-9fe7-db603173e122",
               "fsavail": null,
               "fsuse%": null,
               "mountpoints": [
                   "[SWAP]"
               ],
               "alignment": 0,
               "min-io": 512,
               "opt-io": 0,
               "phy-sec": 512,
               "log-sec": 512,
               "rota": false,
               "sched": "none",
               "rq-size": 1023,
               "ra": 128,
               "wsame": 0
            }
         ]
      }
   ]
}

lsblk -A -b -O -J
#Output:
{
  "blockdevices": [
    {
      "alignment": 0,
      "id-link": "wwn-0x50014ee269e77b9b",
      "id": "0x50014ee269e77b9b",
      "disc-aln": 0,
      "dax": false,
      "disc-gran": 4096,
      "disk-seq": 11,
      "disc-max": 4294966784,
      "disc-zero": false,
      "fsavail": null,
      "fsroots": [
        null
      ],
      "fssize": null,
      "fstype": null,
      "fsused": null,
      "fsuse%": null,
      "fsver": null,
      "group": "disk",
      "hctl": "1:0:0:0",
      "hotplug": true,
      "kname": "sda",
      "label": null,
      "log-sec": 512,
      "maj:min": "8:0",
      "min-io": 4096,
      "mode": "brw-rw----",
      "model": "WDC WD50NDZW-11BCSS0",
      "mq": "  1",
      "name": "sda",
      "opt-io": 0,
      "owner": "root",
      "partflags": null,
      "partlabel": null,
      "partn": null,
      "parttype": null,
      "parttypename": null,
      "partuuid": null,
      "path": "/dev/sda",
      "phy-sec": 4096,
      "pkname": null,
      "pttype": "gpt",
      "ptuuid": "e43ba4bf-a686-4058-888d-6da643591105",
      "ra": 128,
      "rand": true,
      "rev": "01.01A01",
      "rm": false,
      "ro": false,
      "rota": true,
      "rq-size": 2,
      "sched": "mq-deadline",
      "serial": "WD-WXD2D7150K7S",
      "size": 5000947302400,
      "start": null,
      "state": "running",
      "subsystems": "block:scsi:usb:pci",
      "mountpoint": null,
      "mountpoints": [
        null
      ],
      "tran": "usb",
      "type": "disk",
      "uuid": null,
      "vendor": "WD      ",
      "wsame": 0,
      "wwn": "0x50014ee269e77b9b",
      "zoned": "none",
      "zone-sz": 0,
      "zone-wgran": 0,
      "zone-app": 0,
      "zone-nr": 0,
      "zone-omax": 0,
      "zone-amax": 0,
      "children": [
        {
          "alignment": 0,
          "id-link": "wwn-0x50014ee269e77b9b-part1",
          "id": "0x50014ee269e77b9b-part1",
          "disc-aln": 0,
          "dax": false,
          "disc-gran": 4096,
          "disk-seq": 11,
          "disc-max": 4294966784,
          "disc-zero": false,
          "fsavail": 2068344623104,
          "fsroots": [
            "/"
          ],
          "fssize": 4960351387648,
          "fstype": "ext4",
          "fsused": 2641942728704,
          "fsuse%": "53%",
          "fsver": "1.0",
          "group": "disk",
          "hctl": null,
          "hotplug": true,
          "kname": "sda1",
          "label": "5TB_easyStroreSV",
          "log-sec": 512,
          "maj:min": "8:1",
          "min-io": 4096,
          "mode": "brw-rw----",
          "model": null,
          "mq": "  1",
          "name": "sda1",
          "opt-io": 0,
          "owner": "root",
          "partflags": null,
          "partlabel": "CC5TB_Tuxc2SVG",
          "partn": 1,
          "parttype": "0fc63daf-8483-4772-8e79-3d69d8477de4",
          "parttypename": "Linux filesystem",
          "partuuid": "c37e5b7e-e9fb-4310-af87-03d0ec1c9445",
          "path": "/dev/sda1",
          "phy-sec": 4096,
          "pkname": "sda",
          "pttype": "gpt",
          "ptuuid": "e43ba4bf-a686-4058-888d-6da643591105",
          "ra": 128,
          "rand": true,
          "rev": null,
          "rm": false,
          "ro": false,
          "rota": true,
          "rq-size": 2,
          "sched": "mq-deadline",
          "serial": null,
          "size": 5000945205248,
          "start": 2048,
          "state": null,
          "subsystems": "block:scsi:usb:pci",
          "mountpoint": "/mnt/usb-WD_5TB_SVG",
          "mountpoints": [
            "/mnt/usb-WD_5TB_SVG"
          ],
          "tran": null,
          "type": "part",
          "uuid": "d81e7a8f-9a5f-479e-8907-39e20cc735f0",
          "vendor": null,
          "wsame": 0,
          "wwn": "0x50014ee269e77b9b",
          "zoned": "none",
          "zone-sz": 0,
          "zone-wgran": 0,
          "zone-app": 0,
          "zone-nr": 0,
          "zone-omax": 0,
          "zone-amax": 0
        }
      ]
    },
    {
      "alignment": 0,
      "id-link": "usb-JetFlash_Transcend_8GB_RBQYIO3R-0:0",
      "id": "JetFlash_Transcend_8GB_RBQYIO3R-0:0",
      "disc-aln": 0,
      "dax": false,
      "disc-gran": 512,
      "disk-seq": 12,
      "disc-max": 0,
      "disc-zero": false,
      "fsavail": null,
      "fsroots": [
        null
      ],
      "fssize": null,
      "fstype": "udf",
      "fsused": null,
      "fsuse%": null,
      "fsver": "1.02",
      "group": "disk",
      "hctl": "2:0:0:0",
      "hotplug": true,
      "kname": "sdb",
      "label": "GRMCPRFRER_FR_DVD",
      "log-sec": 512,
      "maj:min": "8:16",
      "min-io": 512,
      "mode": "brw-rw----",
      "model": "Transcend 8GB",
      "mq": "  1",
      "name": "sdb",
      "opt-io": 0,
      "owner": "root",
      "partflags": null,
      "partlabel": null,
      "partn": null,
      "parttype": null,
      "parttypename": null,
      "partuuid": null,
      "path": "/dev/sdb",
      "phy-sec": 512,
      "pkname": null,
      "pttype": "dos",
      "ptuuid": "00029d6e",
      "ra": 128,
      "rand": true,
      "rev": "8.07",
      "rm": true,
      "ro": false,
      "rota": true,
      "rq-size": 2,
      "sched": "mq-deadline",
      "serial": "RBQYIO3R",
      "size": 8032092160,
      "start": null,
      "state": "running",
      "subsystems": "block:scsi:usb:pci",
      "mountpoint": null,
      "mountpoints": [
        null
      ],
      "tran": "usb",
      "type": "disk",
      "uuid": "4bd9f39e001242d9",
      "vendor": "JetFlash",
      "wsame": 0,
      "wwn": null,
      "zoned": "none",
      "zone-sz": 0,
      "zone-wgran": 0,
      "zone-app": 0,
      "zone-nr": 0,
      "zone-omax": 0,
      "zone-amax": 0,
      "children": [
        {
          "alignment": 0,
          "id-link": "usb-JetFlash_Transcend_8GB_RBQYIO3R-0:0-part1",
          "id": "JetFlash_Transcend_8GB_RBQYIO3R-0:0-part1",
          "disc-aln": 0,
          "dax": false,
          "disc-gran": 512,
          "disk-seq": 12,
          "disc-max": 0,
          "disc-zero": false,
          "fsavail": 4278644736,
          "fsroots": [
            "/"
          ],
          "fssize": 8015368192,
          "fstype": "vfat",
          "fsused": 3736723456,
          "fsuse%": "47%",
          "fsver": "FAT32",
          "group": "disk",
          "hctl": null,
          "hotplug": true,
          "kname": "sdb1",
          "label": "WIN7ULT3264",
          "log-sec": 512,
          "maj:min": "8:17",
          "min-io": 512,
          "mode": "brw-rw----",
          "model": null,
          "mq": "  1",
          "name": "sdb1",
          "opt-io": 0,
          "owner": "root",
          "partflags": null,
          "partlabel": null,
          "partn": 1,
          "parttype": "0xb",
          "parttypename": "W95 FAT32",
          "partuuid": "00029d6e-01",
          "path": "/dev/sdb1",
          "phy-sec": 512,
          "pkname": "sdb",
          "pttype": "dos",
          "ptuuid": "00029d6e",
          "ra": 128,
          "rand": true,
          "rev": null,
          "rm": true,
          "ro": false,
          "rota": true,
          "rq-size": 2,
          "sched": "mq-deadline",
          "serial": null,
          "size": 8031043584,
          "start": 2048,
          "state": null,
          "subsystems": "block:scsi:usb:pci",
          "mountpoint": "/media/claude/WIN7ULT3264",
          "mountpoints": [
            "/media/claude/WIN7ULT3264"
          ],
          "tran": null,
          "type": "part",
          "uuid": "D62E-0452",
          "vendor": null,
          "wsame": 0,
          "wwn": null,
          "zoned": "none",
          "zone-sz": 0,
          "zone-wgran": 0,
          "zone-app": 0,
          "zone-nr": 0,
          "zone-omax": 0,
          "zone-amax": 0
        }
      ]
    },
    {
      "alignment": 0,
      "id-link": "nvme-eui.2c3ebf30383337310000000000000000",
      "id": "eui.2c3ebf30383337310000000000000000",
      "disc-aln": 0,
      "dax": false,
      "disc-gran": 512,
      "disk-seq": 9,
      "disc-max": 2199023255040,
      "disc-zero": false,
      "fsavail": null,
      "fsroots": [
        null
      ],
      "fssize": null,
      "fstype": null,
      "fsused": null,
      "fsuse%": null,
      "fsver": null,
      "group": "disk",
      "hctl": null,
      "hotplug": false,
      "kname": "nvme1n1",
      "label": null,
      "log-sec": 512,
      "maj:min": "259:0",
      "min-io": 512,
      "mode": "brw-rw----",
      "model": "Patriot M.2 P300 1024GB",
      "mq": "  8",
      "name": "nvme1n1",
      "opt-io": 0,
      "owner": "root",
      "partflags": null,
      "partlabel": null,
      "partn": null,
      "parttype": null,
      "parttypename": null,
      "partuuid": null,
      "path": "/dev/nvme1n1",
      "phy-sec": 512,
      "pkname": null,
      "pttype": "dos",
      "ptuuid": "121ef9a9",
      "ra": 128,
      "rand": false,
      "rev": "APF1M3R1",
      "rm": false,
      "ro": false,
      "rota": false,
      "rq-size": 1023,
      "sched": "none",
      "serial": "P300HHBB240225008371",
      "size": 1024209543168,
      "start": null,
      "state": "live",
      "subsystems": "block:nvme:pci",
      "mountpoint": null,
      "mountpoints": [
        null
      ],
      "tran": "nvme",
      "type": "disk",
      "uuid": null,
      "vendor": null,
      "wsame": 0,
      "wwn": "eui.2c3ebf30383337310000000000000000",
      "zoned": "none",
      "zone-sz": 0,
      "zone-wgran": 0,
      "zone-app": 0,
      "zone-nr": 0,
      "zone-omax": 0,
      "zone-amax": 0,
      "children": [
        {
          "alignment": 0,
          "id-link": "nvme-eui.2c3ebf30383337310000000000000000-part1",
          "id": "eui.2c3ebf30383337310000000000000000-part1",
          "disc-aln": 0,
          "dax": false,
          "disc-gran": 512,
          "disk-seq": 9,
          "disc-max": 2199023255040,
          "disc-zero": false,
          "fsavail": 244892385280,
          "fsroots": [
            "/"
          ],
          "fssize": 1006979268608,
          "fstype": "ext4",
          "fsused": 710859706368,
          "fsuse%": "71%",
          "fsver": "1.0",
          "group": "disk",
          "hctl": null,
          "hotplug": false,
          "kname": "nvme1n1p1",
          "label": null,
          "log-sec": 512,
          "maj:min": "259:1",
          "min-io": 512,
          "mode": "brw-rw----",
          "model": null,
          "mq": "  8",
          "name": "nvme1n1p1",
          "opt-io": 0,
          "owner": "root",
          "partflags": null,
          "partlabel": null,
          "partn": 1,
          "parttype": "0x83",
          "parttypename": "Linux",
          "partuuid": "121ef9a9-01",
          "path": "/dev/nvme1n1p1",
          "phy-sec": 512,
          "pkname": "nvme1n1",
          "pttype": "dos",
          "ptuuid": "121ef9a9",
          "ra": 128,
          "rand": false,
          "rev": null,
          "rm": false,
          "ro": false,
          "rota": false,
          "rq-size": 1023,
          "sched": "none",
          "serial": null,
          "size": 1024208000000,
          "start": 2048,
          "state": null,
          "subsystems": "block:nvme:pci",
          "mountpoint": "/home",
          "mountpoints": [
            "/home"
          ],
          "tran": "nvme",
          "type": "part",
          "uuid": "b658c94a-b41b-466d-9571-6b0b56957f4b",
          "vendor": null,
          "wsame": 0,
          "wwn": "eui.2c3ebf30383337310000000000000000",
          "zoned": "none",
          "zone-sz": 0,
          "zone-wgran": 0,
          "zone-app": 0,
          "zone-nr": 0,
          "zone-omax": 0,
          "zone-amax": 0
        }
      ]
    },
    {
      "alignment": 0,
      "id-link": "nvme-eui.6479a78ffac00168",
      "id": "eui.6479a78ffac00168",
      "disc-aln": 0,
      "dax": false,
      "disc-gran": 512,
      "disk-seq": 10,
      "disc-max": 2199023255040,
      "disc-zero": false,
      "fsavail": null,
      "fsroots": [
        null
      ],
      "fssize": null,
      "fstype": null,
      "fsused": null,
      "fsuse%": null,
      "fsver": null,
      "group": "disk",
      "hctl": null,
      "hotplug": false,
      "kname": "nvme0n1",
      "label": null,
      "log-sec": 512,
      "maj:min": "259:2",
      "min-io": 512,
      "mode": "brw-rw----",
      "model": "PNY CS1030 250GB SSD",
      "mq": "  8",
      "name": "nvme0n1",
      "opt-io": 0,
      "owner": "root",
      "partflags": null,
      "partlabel": null,
      "partn": null,
      "parttype": null,
      "parttypename": null,
      "partuuid": null,
      "path": "/dev/nvme0n1",
      "phy-sec": 512,
      "pkname": null,
      "pttype": "dos",
      "ptuuid": "cf5a1ba0",
      "ra": 128,
      "rand": false,
      "rev": "CS103601",
      "rm": false,
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