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awk, help me - counting items and listing them

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# 1  
Old 09-15-2011
Power awk, help me - counting items and listing them
This is my first ever post... please help! Smilie

I have two columns....here is part of the file...
Code:
12,                                             46798                                   
6692,                                          46799                                   
5710,                                          46799                                   
12,                                             46799                                   
6692,                                          46800                                   
5710,                                          46800                                   
12,                                             46800                                   
12,                                             46805

I want to know the number of times that the value in column 2 appears as well as the corresponding values in column 1

So I'm trying to get this....
Code:
Col2,          No of times it Occurs,      Col1 values for col2
46798,        1,                    12
46799,        3,                    6692, 5710, 12                
46800,        3,                    6692, 5710, 12   
46805,        1,                    12

Many many thanks for any help...


Moderator's Comments:
Mod Comment Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks. Some less comic-like speech in the subject please, thanks. See PM for code tags.
Last edited by zaxxon; 09-15-2011 at 08:12 AM.. Reason: code tags
# 2  
Old 09-15-2011
Code:
for i in `awk -F, '{print $2|"uniq"}' infile`
do
echo "$i `grep -c $i infile`"
grep $i infile | awk '{print $1|"xargs"}'
done | paste - -

# 3  
Old 09-15-2011
Code:
$> cat mach.ksh
awk '
     BEGIN{
          printf("%-10s%-10s%-30s\n","Col2","Count","Values")
     }
     {
          gsub(/,/,"",$1)
          a[$2]++
          b[$2]?b[$2]=b[$2] x $1:b[$2]=$1
     }
     END{
          for(x in a){
               printf("%-10s%-10s%-30s\n",x",",a[x]",",b[x])
          }
     }
' x=", " infile

Output:
Code:
$> ./mach.ksh
Col2      Count     Values
46798,    1,        12
46799,    3,        6692, 5710, 12
46800,    3,        6692, 5710, 12
46805,    1,        12

# 4  
Old 09-15-2011
Code:
awk -F', +' 'END {
  for (k in v)
    print k, c[k], v[k]
  }
{
  v[$2] = $2 in v ? v[$2] ", " $1 : $1
  c[$2]++
   }' OFS=',\t' infile

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