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sort date issue

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# 1  
Old 09-14-2009
sort date issue
Hi Everyone,

Code:
[root@sl ~]# cat b
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;
[root@sl ~]# sort -t';' -k5 b
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
[root@sl ~]# sort -t';' -nk5 b
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;
[root@sl ~]# sort -t';' -Mk5 b
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;
[root@sl ~]#

I tried few sort, but failed, the output should be
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;


Please advice. Thanks
# 2  
Old 09-14-2009
Can you explain about your expected output?
Which field/data is sorted?
huh! could not find out Smilie
# 3  
Old 09-14-2009
As I understand your problem, you want to sort the file on the colored date fields don't you?

Code:
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;

If this is the case, you are in trouble with the sort command as it doesn't sort on plain text dates AFAIK.

So, first you have to loop through your file and convert the date field into some sort of ISO date format like 2009-09-13 21:15:07 and than, pipe it into sort.

Or use awk with this suggestion:
Code:
# sortdate.awk
BEGIN{
	FS=OFS=";"
	months="Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec"
	split(months, m, " ")
	for (i in m) mm[m[i]]=i
}
{
	split($5, dte, " ")
	split(dte[5], time, ":")
	dteKey=sprintf("%s%02d%s%s%s%s",dte[4],mm[dte[3]],dte[2],(dte[6]=="PM")?time[1]+12:time[1],time[2],time[3])
	record[dteKey$0]=$0
	sortKey[NR]=dteKey$0
}
END{
	n=asort(sortKey)
	for(i=1;i<=n;i++) print record[sortKey[i]]
}

Code:
$ cat file
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;

Code:
$ awk -f sortdate.awk file
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 11:32:49 AM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;

Last edited by ripat; 09-14-2009 at 05:29 AM.. Reason: logic error on the sort key
# 4  
Old 09-14-2009
I think the below command is enough for your requirement.

Code:
sort -rk 5 f1.txt

# 5  
Old 09-14-2009
Quote:
Originally Posted by siba.s.nayak
I think the below command is enough for your requirement.

Code:
sort -rk 5 f1.txt

I don't think so. Check on a input file like this:
Code:
$ cat file
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Nov 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;

$ sort -rk 5 file
Sat 14 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Sep 2009 10:31:49 PM MYT;
Sat 12 Sep 2009 10:31:49 PM MYT;a;a;a;Sun 13 Nov 2009 11:32:49 AM MYT;
Sat 13 Sep 2009 10:31:49 PM MYT;a;a;a;Mon 14 Sep 2009 10:31:49 PM MYT;

# 6  
Old 09-14-2009
Ohh, I was lost some where. I forgot it's sorting date wise. Thanks a lot.....
# 7  
Old 09-14-2009
Just noticed the OP requested a descending order on date. Assuming the snippet will not be used past year 3000, just change these two lines:

Code:
	record[(3*10^13-dteKey)$0]=$0
	sortKey[NR]=(3*10^13-dteKey)$0
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