要区分两个文件的前k行:
$ diff <(head -k file1) <(head -k file2)
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相似,为了区分最后的k行:
$ diff <(tail -k file1) <(tail -k file2)
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要将行i区分为j:
diff <(sed -n 'i,jp' file1) <(sed -n 'i,jp' file2)
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