Given the commands below, what will be the output?

medium📝 Command Output Q5 of 15

Linux CLI - Environment and Configuration

export VAR1=foo
VAR2=bar
bash -c 'echo $VAR1 $VAR2'

Afoo

Bfoo bar

C bar

D(no output — empty line)

Step-by-Step Solution

Solution:

Step 1: Identify exported and non-exported variables
VAR1 is exported, so it is visible in the child shell. VAR2 is not exported, so it is not visible.
Step 2: Analyze the echo output in the child shell
The child shell prints $VAR1 as foo and $VAR2 as empty, resulting in foo .
Final Answer:
foo -> Option A
Quick Check:
Only exported variables visible in subshell = foo [OK]

Quick Trick: Only exported vars pass to child shells [OK]

Common Mistakes:

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