The missing do keyword is the reason for the syntax error. Bash for loops must include a do statement before executing commands within the loop.

Corrected script:

#!/bin/bash

for i in {1..254}; do

ping -c1 192.168.1.$i

done

From the CompTIA PenTest+ PT0-003 Official Study Guide (Chapter 4 – Scanning and Enumeration):

“In Bash scripting, control structures like for-loops require correct syntax, including the ' do ' keyword for loop logic to execute properly.”