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Awk to print distinct col values

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Top Forums Shell Programming and Scripting Awk to print distinct col values
# 8  
Old 08-14-2008
Hi...
Well, once after the condition is met, is this the best way to print specific cols like $1 or $4 or whatever....

awk -F, '!($2<10)' unique | awk -F, '{print $1,$2}'

-Anduzzi
# 9  
Old 08-14-2008
Quote:
Originally Posted by anduzzi
Hi...
Well, once after the condition is met, is this the best way to print specific cols like $1 or $4 or whatever....

awk -F, '!($2<10)' unique | awk -F, '{print $1,$2}'

-Anduzzi
You can get that by lightly tweaking era's awk solution.
Code:
awk -F , '{ a[$2] = $1 } END { for (b in a) { if (b+0 < 10) print a[b], b } }' file

# 10  
Old 08-14-2008
Confused !!
Hi Shamrock,
I am lilttle confused with ur solution.
Could you please explain what exactly your one-liner does?...
Also, how would you customize your one-liner to print multiple desired cols like $1, $10,$100 once the condition is met.

-Anduzzi.
# 11  
Old 08-14-2008
Quote:
Originally Posted by anduzzi
Hi Shamrock,
I am lilttle confused with ur solution.
Could you please explain what exactly your one-liner does?...
Also, how would you customize your one-liner to print multiple desired cols like $1, $10,$100 once the condition is met.

-Anduzzi.
It stores unique values in col2 alongwith its counterparts from col1
Code:
a[$2] = $1

After going through the entire file it prints out only those records where col2 < 10
Code:
if (b+0 < 10) print a[b], b

"Store first Print later" to print mutliple desired cols like $1, $10, $100 once the condition is met append them to the assignment list.
Code:
a[$2] = $1 FS $10 FS $100

Last edited by shamrock; 08-14-2008 at 01:49 PM..
# 12  
Old 08-15-2008
Shamrock,
Thank you very much for the explanation.
Got one more question...
How do we replace a NULL with a SPACE using awk?...
In other words, how does awk interpret Nulls and Spaces?...wondering if it can do this replacement in hexadecimal(%x) mode...pls suggest !!!

Thanks !!!
# 13  
Old 08-15-2008
How about some sample data input and output...that would help a great deal.
# 14  
Old 08-15-2008
oops...no data
Hi,
I was trying to help my mate on this issue and unfortunately, he is off today and I dont have the test data corresponding to this..
I can provide the data next week.

Thanks for a quick turn around though.
-Anduzzi
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