awk help


 
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# 1  
Old 05-20-2013
awk help

Hi guys,

I have yet another awk question. I have a list of items:

Code:
Lemon Juice
Orange
Lemon Juice
Apple
Lemon

I need to be able to count, through an awk script the number of times a 'line' (think Lemon Juice instead of only Lemon) repeats itself in the list of items. I got as far as counting the number of times a word repeat itself with the following (thanks to Google):

Code:
{for (i=1;i<=NF;i++)
    count[$i]++
}
END {
    for (i in count)
        print count[i], i
}

But that wil spit out every occurance of the words in the list:
Code:
3 Lemon
2 Juice
1 Orange
1 Apple

Whereas what I would need is:
Code:
1 Lemon
2 Lemon Juice
1 Orange
1 Apple

Could anybody pinpoint where and how I could change the script to count lines of words instead of individual words? Thank you!

Last edited by Scrutinizer; 05-20-2013 at 03:36 PM.. Reason: code tags also for data
# 2  
Old 05-20-2013
Based on your input being just like that:
Code:
$ awk 'END {for (a in A) print A[a], a} {A[$0]++}' file1
1 Orange
1 Lemon
2 Lemon Juice
1 Apple

This User Gave Thanks to Scott For This Post:
# 3  
Old 05-20-2013
Quote:
Originally Posted by Scott
Based on your input being just like that:
Code:
$ awk 'END {for (a in A) print A[a], a} {A[$0]++}' file1
1 Orange
1 Lemon
2 Lemon Juice
1 Apple

That was a quick response! I tried it and it worked like a charm! I really need to study awk, such a powerful tool yet somehow it always confuses me.

Again, thank you a million! Cheers!
# 4  
Old 05-20-2013
In your original script
Code:
{for (i=1;i<=NF;i++)
    count[$i]++
}

loops through each field. Replace it by
Code:
{
   count[$0]++
}

and it runs once on the whole line.
While the { } section runs for each line.
The END { } section runs once at the end.
Scott put the latter first ...
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