There are several commands that may be used to list the partitions of a Linux computer. Likely the most common one is the fdisk command. While it fdisk command is capable of just about anything, I am not always in the need to see all the information that listing the partitions provides, particularly when there are many partitions. So, I have a couple of command line arguments that I use to simplify the display a little bit.
[root@server1 ~]# fdisk -l Disk /dev/sda: 12.9 GB, 12884901888 bytes 255 heads, 63 sectors/track, 1566 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000e8571 Device Boot Start End Blocks Id System /dev/sda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 64 1084 8192000 83 Linux /dev/sda3 1084 1212 1024000 82 Linux swap / Solaris /dev/sda4 1212 1567 2853888 5 Extended /dev/sda5 1212 1339 1024000 83 Linux Disk /dev/sdb: 21.5 GB, 21474836480 bytes 213 heads, 34 sectors/track, 5791 cylinders Units = cylinders of 7242 * 512 = 3707904 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x9088bceb Device Boot Start End Blocks Id System /dev/sdb1 1 5792 20970496 83 Linux Disk /dev/sdc: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdc1 1 262 2104483+ 82 Linux swap / Solaris /dev/sdc2 263 275 102400 82 Linux swap / Solaris Partition 2 does not end on cylinder boundary. Disk /dev/sdd: 21.5 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sde: 2147.5 GB, 2147483648000 bytes 255 heads, 63 sectors/track, 261083 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000f30a1 Device Boot Start End Blocks Id System /dev/sde1 1 261083 2097149166 fd Linux raid autodetect Disk /dev/sdf: 2147.5 GB, 2147483648000 bytes 255 heads, 63 sectors/track, 261083 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0008dc93 Device Boot Start End Blocks Id System /dev/sdf1 1 261083 2097149166 fd Linux raid autodetect Disk /dev/sdg: 2147.5 GB, 2147483648000 bytes 255 heads, 63 sectors/track, 261083 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0008de46 Device Boot Start End Blocks Id System /dev/sdg1 1 261083 2097149166 fd Linux raid autodetect Disk /dev/md0: 4294.7 GB, 4294692569088 bytes 2 heads, 4 sectors/track, 1048508928 cylinders Units = cylinders of 8 * 512 = 4096 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 524288 bytes / 1048576 bytes Disk identifier: 0x00000000
That’s a lot of information, where I only wanted to list the partitions. So, I issued the same command, this time piping it through grep looking for any line that begins (hence the “^”) with the forward slash (“/”).
[root@server1 ~]# fdisk -l | grep '^/' /dev/sda1 * 1 64 512000 83 Linux /dev/sda2 64 1084 8192000 83 Linux /dev/sda3 1084 1212 1024000 82 Linux swap / Solaris /dev/sda4 1212 1567 2853888 5 Extended /dev/sda5 1212 1339 1024000 83 Linux /dev/sdb1 1 5792 20970496 83 Linux /dev/sdc1 1 262 2104483+ 82 Linux swap / Solaris /dev/sdc2 263 275 102400 82 Linux swap / Solaris /dev/sde1 1 261083 2097149166 fd Linux raid autodetect /dev/sdf1 1 261083 2097149166 fd Linux raid autodetect /dev/sdg1 1 261083 2097149166 fd Linux raid autodetect
What if I only wanted the Disks.
[root@server1 ~]# fdisk -l | grep 'Disk /' Disk /dev/sda: 12.9 GB, 12884901888 bytes Disk /dev/sdb: 21.5 GB, 21474836480 bytes Disk /dev/sdc: 21.5 GB, 21474836480 bytes Disk /dev/sdd: 21.5 GB, 21474836480 bytes Disk /dev/sde: 2147.5 GB, 2147483648000 bytes Disk /dev/sdf: 2147.5 GB, 2147483648000 bytes Disk /dev/sdg: 2147.5 GB, 2147483648000 bytes Disk /dev/md0: 4294.7 GB, 4294692569088 bytes
Lets display both the disks and partitions together.
[root@server1 ~]# fdisk -l | grep 'Disk /\|^/' Disk /dev/sda: 12.9 GB, 12884901888 bytes /dev/sda1 * 1 64 512000 83 Linux /dev/sda2 64 1084 8192000 83 Linux /dev/sda3 1084 1212 1024000 82 Linux swap / Solaris /dev/sda4 1212 1567 2853888 5 Extended /dev/sda5 1212 1339 1024000 83 Linux Disk /dev/sdb: 21.5 GB, 21474836480 bytes /dev/sdb1 1 5792 20970496 83 Linux Disk /dev/sdc: 21.5 GB, 21474836480 bytes /dev/sdc1 1 262 2104483+ 82 Linux swap / Solaris /dev/sdc2 263 275 102400 82 Linux swap / Solaris Disk /dev/sdd: 21.5 GB, 21474836480 bytes Disk /dev/sde: 2147.5 GB, 2147483648000 bytes /dev/sde1 1 261083 2097149166 fd Linux raid autodetect Disk /dev/sdf: 2147.5 GB, 2147483648000 bytes /dev/sdf1 1 261083 2097149166 fd Linux raid autodetect Disk /dev/sdg: 2147.5 GB, 2147483648000 bytes /dev/sdg1 1 261083 2097149166 fd Linux raid autodetect Disk /dev/md0: 4294.7 GB, 4294692569088 bytes
To make this an alias command so that you don’t have to remember the entire line each time.
[root@server1 /]# alias disks="fdisk -l | grep 'Disk /\|^/'"
So next time, you can simply type disks for the same result as fdisk -l | grep ‘Disk /\|^/’. Of course you can alias to another name more suitable to your needs. To remove the alias.
[root@server1 /]# unalias disks
The goal of this exercise was to simplify the display of the fdisk output. Before anyone gets too excited about the drive sizes and the multiple swap partitions. This is a test virtual machine to test various fdisk and parted commands. Where it should be noted that parted was used to create the 4.3TB partition as fdisk is limited to 2TB partitions. Don’t use fdisk on that partition or you will risk losing all your data on that partition.
