FSTAB

fdisk is a command-line utility used to manipulate disk partition tables on Linux. It's often used for creating, deleting, resizing, and managing disk partitions. Here's a basic cheat sheet for fdisk:

Starting fdisk

• Launch fdisk on a Specific Disk:

  sudo fdisk /dev/sdX
  

  Replace /dev/sdX with the specific disk (e.g., /dev/sda).

Basic fdisk Commands

• m: Display the help menu.
• p: Print the partition table.
• n: Add a new partition.
• d: Delete a partition.
• t: Change a partition's system id (type).
• l: List known partition types.
• w: Write the table to disk and exit.
• q: Quit without saving changes.

Creating a New Partition

1. Start fdisk: sudo fdisk /dev/sdX.
2. Create Partition: Press n for a new partition.
3. Select Type: Choose p for primary or e for extended.
4. Specify Partition Number: Choose a number (e.g., 1).
5. Set the Start and End: Accept the default start sector and specify the end (or size).
6. Write and Exit: Press w to write changes and exit.

Deleting a Partition

1. Start fdisk: sudo fdisk /dev/sdX.
2. Delete Partition: Press d.
3. Select Partition Number: Enter the number of the partition to delete.
4. Write and Exit: Press w to write changes and exit.

Changing a Partition Type

1. Start fdisk: sudo fdisk /dev/sdX.
2. Change Type: Press t.
3. Select Partition: Enter the partition number.
4. Enter Hex Code: Enter the hex code for the desired type (use l to list codes).
5. Write and Exit: Press w to write changes and exit.

Tips

• Always back up important data before making changes to disk partitions.
• After changing disk partitions, you may need to format new partitions using mkfs (e.g., mkfs.ext4 for an ext4 filesystem).
• Use lsblk or fdisk -l to list all block devices and their partition layouts.
• Be cautious while using fdisk as improper use can lead to data loss.