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I have same: 1.txt with apple written in it, 2.txt with mango written in it, 3.txt with apple written in it, 4.txt with mango written in it.

grep -e apple -e mango *.txt will give result as:

1.txt: apple
2.txt: mango
3.txt: apple
4.txt: mango

But I need output as:

1.txt: apple
3.txt: apple
2.txt: mango
4.txt: mango

Is it possible with just grep command ? -- without using any other command like sort or so

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    No, and even if there was, it would be wrong. Use sort. – Chris Down Mar 26 '15 at 13:11
  • No, grep does not perform sorting. – jordanm Mar 26 '15 at 13:11
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    If you want to use only grep then you've to do grep -e apple *.txt; grep -e mango *.txt manually – Pandya Mar 26 '15 at 13:22
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It is not possible by only using grep. You have to use another tool e.g. sort:

$ grep -e apple -e mango *.txt | sort -t: -k2,2
1.txt:apple
3.txt:apple
2.txt:mango
4.txt:mango

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