.. SPDX-License-Identifier: GPL-2.0+: part command ============ Synopis ------- :: part uuid : [varname] part list [flags] [varname] part start part size part number part set part type : [varname] part types Description ----------- The `part` command is used to manage disk partition related commands. The 'part uuid' command prints or sets an environment variable to partition UUID interface interface for accessing the block device (mmc, sata, scsi, usb, ....) dev device number part partition number varname an optional environment variable to store the current partition UUID value into. The 'part list' command prints or sets an environment variable to the list of partitions interface interface for accessing the block device (mmc, sata, scsi, usb, ....) dev device number part partition number flags -bootable lists only bootable partitions varname an optional environment variable to store the list of partitions value into. The 'part start' commnad sets an environment variable to the start of the partition (in blocks), part can be either partition number or partition name. interface interface for accessing the block device (mmc, sata, scsi, usb, ....) dev device number part partition number varname a variable to store the current start of the partition value into. The 'part size' command sets an environment variable to the size of the partition (in blocks), part can be either partition number or partition name. interface interface for accessing the block device (mmc, sata, scsi, usb, ....) dev device number part partition number varname a variable to store the current size of the partition value into. The 'part number' command sets an environment variable to the partition number using the partition name, part must be specified as partition name. interface interface for accessing the block device (mmc, sata, scsi, usb, ....) dev device number part partition number varname a variable to store the current partition number value into The 'part set' command sets the type of a partition. This is useful when autodetection fails or does not do the correct thing: interface interface for accessing the block device (mmc, sata, scsi, usb, ....) dev device number part partition number type partition type to use (see 'part types') to check available types The 'part type' command prints or sets an environment variable to the partition type UUID. interface interface for accessing the block device (mmc, sata, scsi, usb, ....) dev device number part partition number varname a variable to store the current partition type UUID value into The 'part types' command list supported partition table types. Examples -------- :: => host bind 0 ./test_gpt_disk_image.bin => part uuid host 0:1 24156b69-3378-497f-bb3e-b982223de528 => part uuid host 0:1 varname => env print varname varname=24156b69-3378-497f-bb3e-b982223de528 => => part list host 0 Partition Map for HOST device 0 -- Partition Type: EFI Part Start LBA End LBA Name Attributes Type GUID Partition GUID 1 0x00000800 0x00000fff "second" attrs: 0x0000000000000000 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 (data) guid: 24156b69-3378-497f-bb3e-b982223de528 2 0x00001000 0x00001bff "first" attrs: 0x0000000000000000 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 (data) guid: 5272ee44-29ab-4d46-af6c-4b45ac67d3b7 => => part start host 0 2 varname => env print varname varname=1000 => => part size host 0 2 varname => env print varname varname=c00 => => part number host 0 2 varname => env print varname varname=0x2 => => part type host 0:1 ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 => part type host 0:1 varname => env print varname varname=ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 => => part types Supported partition tables: EFI, AMIGA, DOS, ISO, MAC This shows looking at a device with multiple partition tables:: => virtio scan => part list virtio 0 Partition Map for VirtIO device 0 -- Partition Type: EFI Part Start LBA End LBA Name Attributes Type GUID Partition GUID 1 0x00000040 0x0092b093 "ISO9660" attrs: 0x1000000000000001 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 guid: a0891d7e-b930-4513-94d8-f629dbd637b2 2 0x0092b094 0x0092d7e7 "Appended2" attrs: 0x0000000000000000 type: c12a7328-f81f-11d2-ba4b-00a0c93ec93b guid: a0891d7e-b930-4513-94db-f629dbd637b2 3 0x0092d7e8 0x0092da3f "Gap1" attrs: 0x1000000000000001 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 guid: a0891d7e-b930-4513-94da-f629dbd637b2 => ls virtio 0:3 => part types Supported partition tables: EFI, DOS, ISO => part set virtio 0 dos Partition Map for VirtIO device 0 -- Partition Type: DOS Part Start Sector Num Sectors UUID Type 1 1 9624191 00000000-01 ee => part set virtio 0 iso Partition Map for VirtIO device 0 -- Partition Type: ISO Part Start Sect x Size Type 1 3020 4 512 U-Boot 2 9613460 10068 512 U-Boot => part set virtio 0 efi Partition Map for VirtIO device 0 -- Partition Type: EFI Part Start LBA End LBA Name Attributes Type GUID Partition GUID 1 0x00000040 0x0092b093 "ISO9660" attrs: 0x1000000000000001 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 guid: a0891d7e-b930-4513-94d8-f629dbd637b2 2 0x0092b094 0x0092d7e7 "Appended2" attrs: 0x0000000000000000 type: c12a7328-f81f-11d2-ba4b-00a0c93ec93b guid: a0891d7e-b930-4513-94db-f629dbd637b2 3 0x0092d7e8 0x0092da3f "Gap1" attrs: 0x1000000000000001 type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 guid: a0891d7e-b930-4513-94da-f629dbd637b2 => Return value ------------ The return value $? is set to 0 (true) if the command succededd. If an error occurs, the return value $? is set to 1 (false).