Linux Distro – Nextra

Filesystem

Standard streams and its file descriptors
- stdin: 0
- stdout: 1
- stderr: 2
> by default redirects stdout, therefore > is equivalent to 1>
>&<FILE_DESCRIPTOR> redirects stdout to another stream.

echo "An error occurred" >&2 # Redirect stdout to stderr
&>, To redirect to either stdout or stderr, depending on the runtime outcome

if cmp a b &> /dev/null # Suppress output whether it's from stdout or stderr

/swap
- What's the right amount of swap space for a modern Linux system? (opens in a new tab)
- Usage
  - Hibernation
  - Memory overflow
/var
- Could assign 500GB if possible
- Usage
  - Application installation
    - /var/lib/flatpak
    - /var/lib/snapd
  - Docker storage, cache, volumes, etc
    - /var/lib/docker
The order of partitions matters, and partitions should be created from the least possible to be resized to the most possible to be resized.
Resources
- 9.15.5. Recommended Partitioning Scheme (opens in a new tab)
- Filesystem Hierarchy Standard (opens in a new tab)

Use username/password to register a system

subscription-manager register --username $username --password $password --auto-attach

If doesn't work, use activation key and organization ID

subscription-manager register --org $organization_id --activationkey $activation_key