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Full Discussion: Sorting times and in different ranks
Top Forums Shell Programming and Scripting Sorting times and in different ranks Post 302961466 by Don Cragun on Sunday 29th of November 2015 11:51:35 PM
Old 11-30-2015
Using colon as the field separator, the 1st field is "M" or "F" followed by a comma followed by a space followed by the digit or digits representing the number of hours in the time field. The option -k1.4,1n says to sort starting in the 4th character of the 1st field (1.4) to the end of the 1st field (,1) as a numeric field (n). The 1.4 skips over the sex field, the comma, and the space and tells sort to start sorting on the hours digit(s) at the end of the 1st field.

Sorting on the entirety of field 1 as a numeric field makes that value be treated as zero in all cases because "M" and "F" are not parts of numeric strings.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT NETBSD

slapo-valsort

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

NAME

       slapo-valsort - Value Sorting overlay to slapd

SYNOPSIS

       /etc/ldap/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/ldap/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							    2012/04/23							  SLAPO-VALSORT(5)
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