Add the Same User to FreeBSD or Linux servers

March 6, 2026

Managing many FreeBSD and Linux servers is easier when all machines use the same user account. In this guide, you create one user, generate one password hash, and add the same user to all servers with a simple Bash script. This method works on FreeBSD and Linux systems.

Here are 5 steps to do that.

1. Generate the password hash

FreeBSD uses SHA‑512 for password hashing. You can create the hash on any machine that has OpenSSL installed.

root@OF:~ # openssl passwd -6 "YourPassword123"
$6$kePS2TPyaJzqukP5$D.5y.PQBm84E27t1dP6AOCrSVJ.O9/u.mfebZRh04DBLG6Sc7.63.Cb51VSZ0Fe3xI3B80KHLlXoBMZ6.eHEY0
root@OF:~ #

This is the hash you will send to each FreeBSD server. The real password stays local.

2. Create a host list

Make a file named hosts.txt with one server per line.

freebsd1.example.com
freebsd2.example.com
192.168.1.10
192.168.1.11

SSH access must already work (password or SSH key).

3. Bash script to add the same user to all FreeBSD servers
#!/bin/bash

USER="newuser"
PASS="YourPassword123"
HOSTFILE="hosts.txt"

# generate SHA-512 hash
HASH=$(openssl passwd -6 "$PASS")

while read -r HOST; do
    echo ">>> $HOST"

    # FreeBSD user creation with hash from stdin
    ssh "$HOST" "sudo pw useradd $USER -m -H 0" <<< "$HASH" \
        && echo "OK" \
        || echo "User exists or error"
done < "$HOSTFILE"

How it works:

  • pw useradd is the FreeBSD user management tool
  • -m creates the home directory
  • -H 0 tells FreeBSD to read the password hash from standard input
  • The hash never appears in the command line on the remote machine
4. Add the user to the wheel group (optional)

If the user needs sudo access:

ssh "$HOST" "sudo pw usermod $USER -G wheel"
5. Verify the user

On any server:

id newuser
grep newuser /etc/master.passwd

If you see $6$ in the password field, the hash is correct.

Summary
  • You generate one SHA‑512 hash locally.
  • You store all server names in hosts.txt.
  • You run one Bash script.
  • All FreeBSD machines get the same user with the same password.
  • The method is clean, simple, and safe for multi‑server environments.