Bash Scripting - Error Handling
What will be the output of this script?
grep 'hello' /dev/null echo $?
What will be the output of this script?
medium📝 Command Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand grep behavior on empty input
Searching 'hello' in /dev/null (empty file) returns no matches but no error.Step 2: Check grep exit code for no matches
grep returns 1 if no lines matched, even when searching /dev/null as it provides empty input.Final Answer:
1 -> Option AQuick Check:
grep no matches = 1 [OK]
Quick Trick: grep returns 1 if no matches, 0 if matches [OK]
Common Mistakes:
MISTAKES- Thinking no matches means exit code 0
- Confusing error with no match
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