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Full Discussion: Sort comand for Date
Top Forums UNIX for Dummies Questions & Answers Sort comand for Date Post 302377100 by quintet on Thursday 3rd of December 2009 06:28:43 AM
Old 12-03-2009
Sort comand for Date
Hi All,

I have two questions for sorting based on date.

Sample input:

Code:
2009/07/23 11:48:44|alpha
2009/07/23 11:48:44|gamme
2009/07/23 11:48:44|beta
2009/07/23 11:48:44|test
2009/07/23 11:48:44|data
2009/07/23 11:48:44|hello
2009/07/23 11:48:44|cat

Output:

Code:
2009/07/23 11:48:44|alpha
2009/07/23 11:48:44|beta
2009/07/23 11:48:44|cat
2009/07/23 11:48:44|data
2009/07/23 11:48:44|gamme
2009/07/23 11:48:44|hello
2009/07/23 11:48:44|test

Question1:

Since the date is in this format yyyy/mm/dd hh24:mm:ss, the simple sort command would sort it correctly. I tested it with many scenarios and as far as sort is concerned its correct. Please correct me if I have made a mistake in this.

Question2:

From the sample data, if the date is the same, the sorting takes the second field and sorts alphabetically.

I tried to avoid this by using
Code:
sort -t'|' +0 -1 test

and

Code:
sort -t'|' -k1,1 test

But the output is same as the command

Code:
sort -t'|' -k1 test

How to restrict this kind of sorting? I want to keep the order as it is in the file if the datestamp is the same

regards...
 

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LEARN ABOUT SUSE

slapo-valsort

SLAPO-VALSORT(5)						File Formats Manual						  SLAPO-VALSORT(5)

NAME

       slapo-valsort - Value Sorting overlay to slapd

SYNOPSIS

       /etc/openldap/slapd.conf

DESCRIPTION

       The  Value Sorting overlay can be used with a backend database to sort the values of specific multi-valued attributes within a subtree. The
       sorting occurs whenever the attributes are returned in a search response.

       Sorting can be specified in ascending or descending order, using either numeric or alphanumeric sort methods.  Additionally,  a	"weighted"
       sort  can  be specified, which uses a numeric weight prepended to the attribute values.	The weighted sort is always performed in ascending
       order, but may be combined with the other methods for values that all have equal weights. The weight is specified by prepending an  integer
       weight  {<weight>} in front of each value of the attribute for which weighted sorting is desired. This weighting factor is stripped off and
       never returned in search results.

CONFIGURATION

       These slapd.conf options apply to the Value Sorting overlay.  They should appear after the overlay directive.

       valsort-attr <attribute> <baseDN> (<sort-method> | weighted [<sort-method>])
	      Configure a sorting method for the specified attribute in the subtree rooted at baseDN.  The sort-method may be one of alpha-ascend,
	      alpha-descend, numeric-ascend, or numeric-descend.  If the special weighted method is specified, a secondary sort-method may also be
	      specified. It is an error to specify an alphanumeric sort-method for an attribute with Integer or NumericString syntax, and it is an
	      error to specify a numeric sort-method for an attribute with a syntax other than Integer or NumericString.

EXAMPLES

	    database bdb
	    suffix dc=example,dc=com
	    ...
	    overlay valsort
	    valsort-attr member ou=groups,dc=example,dc=com alpha-ascend

FILES

       /etc/openldap/slapd.conf
	      default slapd configuration file

SEE ALSO

       slapd.conf(5), slapd-config(5).

ACKNOWLEDGEMENTS

       This module was written in 2005 by Howard Chu of Symas Corporation. The work was sponsored by Stanford University.

OpenLDAP 2.4.21 						    2009/12/20							  SLAPO-VALSORT(5)
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