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Editorial Team
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Asked: 2026-06-04T02:02:49+00:00

I am trying to get disk information from fdisk -l output on linux. fdisk

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I am trying to get disk information from fdisk -l output on linux. 

fdisk -l | grep -E 'Disk /dev/sd.\:'

I get the following output.

Disk /dev/sde doesn't contain a valid partition table
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes

but what I want to get is

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes

I tried to do this 

fdisk -l | grep -E 'Disk /dev/sd.\:' | grep -v "contain"

but I have no idea why grep is not ignoring the line containing “contain”.

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1 Answer

  1. Editorial Team

    Try this command:

    fdisk -l 2>/dev/null | grep -E 'Disk /dev/sd.\:'

    OR simply:

    fdisk -l 2>/dev/null

    Problem is that the line Disk /dev/sde doesn't contain a valid partition table is being generated as error and being written on stderr instead of stdout.

    Pipe in unix only pipes output written on stdout from previous command with the command on RHS of pipe hence your grep command is only working on 2nd and 3rd line while 1st line on your terminal is coming from stderr.

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