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Using grep to find multiple whitespaces

 
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# 1  
Old 12-15-2009
Using grep to find multiple whitespaces
Hi All,

Have a query on finding the lines with at least one whitespace. Have following lines in my file myfile.txt

Code:
I
I LOVE
I LOVE FREEDOM
I  LOVE  FREEDOM
I LOVE FREEDOM AND PEACE

I ran the following query to get the lines with at least 3 words.
Code:
grep '\([^ ]* +\)\{3,\}' myfile.txt

But it does not written any lines. Can someone please tell me the issue here


Regards,
sh_kk
Last edited by sh_kk; 12-15-2009 at 01:28 PM.. Reason: use code tags please
# 2  
Old 12-15-2009
Hi

Your post is a little confusing.

Subject: Using grep to find multiple whitespaces (I presume between words)
Code:
grep "  \+" myfile.txt (two spaces there)

Body: Have a query on finding the lines with at least one whitespace (I presume anywhere)
Code:
grep " " myfile.txt

If you show the desired output, then it would be clear.
# 3  
Old 12-15-2009
Code:
grep "  *.* " file_in

because the regexp character * means "0 or more repeats of the previous character", you need to put 2 spaces in the regexp.

even better, for 3 and 3 only words:

Code:
grep "^[^ ]*  *[^ ]*  *[^ ]*$" file_in

Last edited by quirkasaurus; 12-15-2009 at 03:27 PM.. Reason: oopsy. one space too many. exactly 3 words only.
# 4  
Old 12-16-2009
Code:
gawk 'NF>=3' file

# 5  
Old 12-21-2009
Quote:
Originally Posted by ichigo
Code:
gawk 'NF>=3' file

winner.
# 6  
Old 12-21-2009
Simple you missed to escape +. Nothing else.,

Code:
grep '\([^ ]* \+\)\{3,\}' t
I  LOVE  FREEDOM
I LOVE FREEDOM AND PEACE


Else, use extended grep, as
Code:
egrep  '([^ ]* +){3,}' t
I  LOVE  FREEDOM
I LOVE FREEDOM AND PEACE

# 7  
Old 12-21-2009
Code:
egrep '[^ ]+ [^ ]+ [^ ]+' file

Code:
egrep '([^ ]+ ){2}[^ ]+' file

Last edited by Scrutinizer; 12-21-2009 at 03:54 PM..
 
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