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grep lines in a file that have only one field

 
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# 1  
Old 10-03-2012
grep lines in a file that have only one field
Hello. How does one grep lines in a file that have only one field?
AAA BBB CCC
DDD
AAA CCC

Is is possible to grep "DDD" becuase it has only one field?

Thanks.

---------- Post updated at 08:03 PM ---------- Previous update was at 07:25 PM ----------

I found it, thank you!
awk 'NF < 2'
# 2  
Old 10-03-2012
grep:
Code:
grep "^[ \t]*[^ \t][^ \t]*[ \t]*$" infile

awk:
Code:
awk 'NF == 1' infile

To not include blank lines.
Last edited by rdrtx1; 10-03-2012 at 11:52 PM..
# 3  
Old 10-03-2012
Would awk work for you?

Code:
awk '($0 ~ /DDD/ && NF==1) { print }' yourfile

 
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