You have a file data.txt with multiple columns separated by spaces. You want to find unique values in the second column only. Which command pipeline works best?

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Bash Scripting - Text Processing in Scripts

You have a file data.txt with multiple columns separated by spaces. You want to find unique values in the second column only. Which command pipeline works best?

Asort data.txt | uniq -f1

Bcut -d ' ' -f2 data.txt | sort | uniq

Cuniq -f1 data.txt | sort

Dcut -d ' ' -f2 data.txt | uniq | sort

Step-by-Step Solution

Solution:

Step 1: Extract second column with cut
cut -d ' ' -f2 extracts the second column from each line.
Step 2: Sort and remove duplicates
sort orders the values, uniq removes duplicates.
Final Answer:
cut -d ' ' -f2 data.txt | sort | uniq -> Option B
Quick Check:
Extract column, then sort and uniq for unique values [OK]

Quick Trick: Use cut to isolate column before sort and uniq [OK]

Common Mistakes:

MISTAKES

Using uniq -f1 incorrectly
Not extracting the column first
Sorting after uniq instead of before

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More Bash Scripting Quizzes

You have a file data.txt with multiple columns separated by spaces. You want to find unique values in the second column only. Which command pipeline works best?

Step 1: Extract second column with cut

Step 2: Sort and remove duplicates

Final Answer:

Quick Check:

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