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Lines with comma


 
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# 1  
Old 01-30-2020
Lines with comma

I have file which contains line with only comma and text separated by comma.
a.txt contain
Code:
a,ab,ac
,,
b,bc,bd
,,
,,
c,cd,ce

need to print only line 2, 4, and 5 because they only contain comma and no text.

I need an unix command to find out.

thanks in advance

Moderator's Comments:
Mod Comment Please do wrap your samples in CODE TAGS as per forum rules.

Last edited by pranabpal; 01-30-2020 at 09:25 AM..
# 2  
Old 01-30-2020
Hello pranabpal,

In UNIX.com we encourage users to add 3 simple things.

1- Sample of Input in CODE TAGS.
2- Sample of expected output in CODE TAGS.
3- Most important thing, add efforts which you have put in order to solve your own problem in CODE TAGS.

Your question doesn't have any of them, so please EDIT your question and let us know then.

Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
# 3  
Old 01-30-2020
Code:
grep ^, a.txt

# 4  
Old 01-31-2020
Quote:
Originally Posted by zouhair
Code:
grep ^, a.txt

^ beginning of the line
, a comma
So it prints all lines that start with a , i.e. if the 1st field is empty.
Perhaps you want to only print if all fields are empty?
BTW it is better to put the RegularExpression string in quotes, in order to avoid unwanted substitiutions from the shell : '^,'
# 5  
Old 01-31-2020
Quote:
Originally Posted by MadeInGermany
^ beginning of the line
, a comma
So it prints all lines that start with a , i.e. if the 1st field is empty.
Perhaps you want to only print if all fields are empty?
BTW it is better to put the RegularExpression string in quotes, in order to avoid unwanted substitiutions from the shell : '^,'
... or anything BUT commaS
# 6  
Old 01-31-2020
Quote:
Originally Posted by vgersh99
... or anything BUT commaS
Wouldn't that require square brackets like '[^,]'?

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