问题
I've got a big text file. I need to extract all the lines which contains the exact word "DUSP1". Here an example of the lines:
9606 ENSP00000239223 DUSP1 BLAST
9606 ENSP00000239223 DUSP1-001 Ensembl
I want to retrieve the first line but not the second one.
I tried several commands as:
grep -E "^DUSP1"
grep '\<DUSP1\>'
grep '^DUSP1$'
grep -w DUSP1
But none of them seem to work. Which option should I use?
回答1:
The problem you are facing is that a dash (-) is considered by grep as a word delimiter.
You should try this command :
grep '\sDUSP1\s' file
to ensure that there's spaces around your word.
回答2:
If you want to grep exactly the whole word, you can use word boundaries like this:
grep '\bDUSP1\b'
This matches for the exact word at the beginning and at the end.
回答3:
adding to what sputpick said, it could either be that or:
grep '\sDUSP1$' file
if the DUSP1 is the end of the line.
来源：https://stackoverflow.com/questions/17616012/extract-only-whole-word-using-grep