[Solved] What will be the output of this command if the cron log contains these lines:Jun 10 10:00:01 server CRON[1234]: (root) CMD (backup.sh) Jun 10 10:05:01 server CRON[1235]: (root) CMD (cleanup.... | Linux CLI

Linux CLI - Cron and Scheduling

What will be the output of this command if the cron log contains these lines:

Jun 10 10:00:01 server CRON[1234]: (root) CMD (backup.sh)
Jun 10 10:05:01 server CRON[1235]: (root) CMD (cleanup.sh)
Jun 10 10:10:01 server CRON[1236]: (root) CMD (backup.sh)

Command: grep backup.sh /var/log/cron

AJun 10 10:00:01 server CRON[1234]: (root) CMD (backup.sh) Jun 10 10:10:01 server CRON[1236]: (root) CMD (backup.sh)

BJun 10 10:05:01 server CRON[1235]: (root) CMD (cleanup.sh)

CNo output

DJun 10 10:00:01 server CRON[1234]: (root) CMD (backup.sh)

Step-by-Step Solution

Solution:

Step 1: Understand grep filtering
The grep backup.sh command filters lines containing 'backup.sh'.
Step 2: Identify matching lines in the log
Two lines contain 'backup.sh': the first and third lines.
Final Answer:
Both lines with backup.sh are shown -> Option A
Quick Check:
grep filters matching lines = C [OK]

Quick Trick: grep shows all lines containing the search term [OK]

Common Mistakes:

Selecting only one matching line
Expecting output for unrelated terms
Thinking grep outputs no lines if multiple matches exist

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More Linux CLI Quizzes

What will be the output of this command if the cron log contains these lines:

Step 1: Understand grep filtering

Step 2: Identify matching lines in the log

Final Answer:

Quick Check:

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