Return Only Line Number, If Pattern 'Exist' and 'Not Exist'. Using 'Grep' Command
I Have This Sample File for My Input: Xyxxyx Xyxx Xxyx Yxyy Yxyx Xxyxxx Xx Xyx Xxx X Y X Xxyy Yxxy Xyxxy Xxy Y X Y Xyxy Xyx Yyxx Xyyxyxy Xyx Yxyy Xyy Yxyx...
I have this sample file for my input:
xyxxyx xyxx xxyx yxyy yxyx
xxyxxx xx xyx xxx x y x xxyy
yxxy xyxxy xxy y x y
xyxy xyx yyxx xyyxyxy xyx
yxyy xyy yxyx xxyxyyx
And I tried to find only "xyx" word if exist in line and return line number. for example in this input just line 2 and 4 have "xyx", and the result I desired is only would be 2 and 4 (line numbers) but grep command give me all 5 lines. this result:
grep -n "xyx" test | cut -f1 -d:
1
2
3
4
5
If I run follow command without cut -f1 -d" I see that find all "xyx" such as in "xyxxyx", "xyxx", "xxyx" and "yxyx" for example in first line, while that is wrong, my pattern only and only exist in line 2 and 4 and it is third word in line 2 and second & 5th word in line 4. See the screen shot:
And the result what I want is, only find separated "xyx" and return line number of that.
output of I desired if pattern exist, it is just:
2
4
output of I desired if pattern not exist, it is just:
1
3
5
and also I don't know which command I should use to check if pattern not exist. I tried with all possible combination of grep command but I failed.
Thank you for helping in advance.
1 Answer
You need to add the -w option
$ grep -wn 'xyx' file | cut -d: -f1
2
4
From man grep
-w, --word-regexp
Select only those lines containing matches that form whole
words. The test is that the matching substring must either be
at the beginning of the line, or preceded by a non-word
constituent character. Similarly, it must be either at the end
of the line or followed by a non-word constituent character.
Word-constituent characters are letters, digits, and the
underscore.
To invert the match, add the -v switch i.e.
grep -vwn 'xyx' file | cut -d: -f1
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