You're replying to a comment by Vishal.

Vishal Permalink
June 20, 2012, 13:12

Why < < is required in:
read -r line < <(head -1 InstId.txt)
where as not in:
diff -q <(sort InstId.txt | uniq) <(sort secId.txt | uniq)
or not in,
comm -12 <(sort InstId.txt | uniq) <(sort secId.txt | uniq)

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