You want to run backup.sh only if prepare.sh succeeds, but if backup.sh fails, you want to run alert.sh. Which command chaining achieves this?

hard📝 Application Q8 of 15

Linux CLI - Pipes and Redirection

You want to run backup.sh only if prepare.sh succeeds, but if backup.sh fails, you want to run alert.sh. Which command chaining achieves this?

Aprepare.sh && backup.sh || alert.sh

Bprepare.sh ; backup.sh ; alert.sh

Cprepare.sh && (backup.sh || alert.sh)

Dprepare.sh || backup.sh && alert.sh

Step-by-Step Solution

Solution:

Step 1: Understand requirement
Run backup.sh only if prepare.sh succeeds, then run alert.sh only if backup.sh fails.
Step 2: Analyze options
prepare.sh && (backup.sh || alert.sh) groups backup.sh and alert.sh with || inside parentheses, so alert.sh runs only if backup.sh fails, after prepare.sh succeeds.
Final Answer:
prepare.sh && (backup.sh || alert.sh) correctly chains commands as required. -> Option C
Quick Check:
Use parentheses to control chaining order [OK]

Quick Trick: Use parentheses to group chained commands correctly [OK]

Common Mistakes:

Not grouping commands, causing wrong execution
Using ; which runs all unconditionally
Confusing order of || and &&

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You want to run backup.sh only if prepare.sh succeeds, but if backup.sh fails, you want to run alert.sh. Which command chaining achieves this?

Step 1: Understand requirement

Step 2: Analyze options

Final Answer:

Quick Check:

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