The xyz.sh wrapper adds no telemetry and does not perform hidden actions. You can read the full source on the page or with curl -fsSL xyz.sh/ .sh before running it. Piping a remote script to bash is still a risk — review the source first. It will not replace an existing swap file without confirmation, and it refuses to create one if free space (plus a 512M margin) is insufficient.

Which operating systems are supported?

Declared support: Debian, Ubuntu, CentOS, Rocky Linux, and AlmaLinux. The script detects the distribution and asks before continuing on an unrecognized OS. Syntax was checked with bash -n and ShellCheck; installer scripts have not been end-to-end verified on every listed distribution.

Yes. Run it as root or via sudo bash. The script exits with a message if it is not root.

How do I uninstall it?

curl -fsSL xyz.sh/swap | bash -s -- --remove. If you used a custom path, add --path /your/path.

What is the default size, and can I change it?

The default is 2G. Pass 4G, --size 1G, or --path /swapfile --size 2048M.

Add Swap on a VPS (Chosen Size, Persisted in fstab)

This tutorial shows how to create and persist a swap file on a Linux VPS with xyz.sh/swap, and how to remove it safely.

Prerequisites

Root is required. The default is a 2G file at /swapfile. The script refuses if fewer than about 512M would remain free after creation.

Steps

Default 2G: curl -fsSL xyz.sh/swap | bash

Custom size: curl -fsSL xyz.sh/swap | bash -s -- 4G or --size 1G --path /swapfile

The script uses fallocate (falling back to dd), sets mode 600, runs mkswap and swapon, and appends an /etc/fstab entry if one is not already present. An existing file at the same path is not replaced without confirmation.

How to verify

Run free -h or swapon --show; the new swap file should be listed.

How to remove

Run curl -fsSL xyz.sh/swap | bash -s -- --remove (add --path if you used a custom file). It swapoffs, removes the matching /etc/fstab entry, and deletes the file.