You run echo "ls" | at now + 1 minute but the job never runs. What is a likely cause?

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Linux CLI - Cron and Scheduling

You run echo "ls" | at now + 1 minute but the job never runs. What is a likely cause?

AThe <code>atd</code> service is not running

BThe <code>ls</code> command is invalid

CYou forgot to specify the time

DThe shell does not support pipes

Step-by-Step Solution

Solution:

Step 1: Identify required service for at
The atd daemon must be running to execute scheduled at jobs.
Step 2: Analyze other options
ls is valid, time is specified, and shell supports pipes, so these are unlikely causes.
Final Answer:
The atd service is not running -> Option A
Quick Check:
atd must run for at jobs = C [OK]

Quick Trick: Check atd daemon status if jobs don't run [OK]

Common Mistakes:

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