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Absolute minimum value of a number using awk


 
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# 1  
Old 08-22-2013
Linux Absolute minimum value of a number using awk

Hi,

I have got a file in the following format:
Code:
4300 23695
4305 03591
4400 125368

I need to sort this file to find the minimum absolute value of the numbers starting from 6th pos, so the expected output is:-
Code:
4300 23569
4305 01359
4400 123568

I tried to cut out the file from 6th position and sort the file using asort function....but in vain.....

need some help....SmilieSmilie

Last edited by Franklin52; 08-22-2013 at 08:28 AM.. Reason: Please use code tags
# 2  
Old 08-22-2013
Quote:
Originally Posted by roy121
I tried to cut out the file from 6th position and sort the file using asort function....but in vain.....

need some help....SmilieSmilie
Please show us your attempted solution.
# 3  
Old 08-22-2013
i used :
Code:
awk '{  n=split($0,arr)  asort(arr)  for(i=0;i<=n;i++)     print arr[i]}' file


but i am getting syntax error...

Last edited by Franklin52; 08-22-2013 at 10:56 AM.. Reason: Please use code tags
# 4  
Old 08-22-2013
try:
Code:
awk '{ n=split($2,arr) ; asort(arr) ; printf $1 " " ; for(i=0;i<=n;i++) printf arr[i]; print ""}' file

# 5  
Old 08-22-2013
Perl version:

Code:
cat file

4300 23695
4305 03591
4400 125368

perl -lane '@a = split(//, $F[1]);@sorted = sort {$a <=> $b} @a;printf("%s ", $F[0]);print @sorted' file

4300 23569
4305 01359
4400 123568

# 6  
Old 08-22-2013
Although it should work, the following is an inefficient approach. I post it for the enjoyment.
Code:
while read a b; do
    echo $a $(echo $b | fold -w1 | sort | paste -sd '')
done

Assumptions are that the file consists of nothing but digits and whitespace.

Regards,
Alister
# 7  
Old 08-22-2013
You need to split $2 with "" (null separator). And the array index starts with 1.
Code:
awk '{n=split($2,arr,""); asort(arr); printf "%s ",$1; for(i=1;i<=n;i++) printf "%s",arr[i]; print ""}' file

Another output formatting:
Code:
awk '{n=split($2,arr,""); asort(arr); s=""; for(i=1;i<=n;i++) s=s""sprintf("%s",arr[i]); print $1,s}' file


Last edited by MadeInGermany; 08-22-2013 at 02:45 PM..
 

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