11-13-2008
What "compare" command are you referring to? Diff? comm? cmp?
As to why sort before compare, imagine you have two phone books: one from last year and one from this year. Could you simply compare the two books, line by line? Yes. Now imagine someone had taken one of the phonebooks, torn out each page and thrown all the pages around the house. Now how will you compare the two? First you would reorganize it so the torn-up phonebook was in its original order. Then you could compare line by line.
Does that help?
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LEARN ABOUT OPENDARWIN
ldap_compare
LDAP_COMPARE(3) Library Functions Manual LDAP_COMPARE(3)
NAME
ldap_compare, ldap_compare_s - Perform an LDAP compare operation
LIBRARY
OpenLDAP LDAP (libldap, -lldap)
SYNOPSIS
#include <ldap.h>
int ldap_compare_s(ld, dn, attr, value)
LDAP *ld;
char *dn, *attr, *value;
int ldap_compare(ld, dn, attr, value)
LDAP *ld;
char *dn, *attr, *value;
DESCRIPTION
The ldap_compare_s() routine is used to perform an LDAP compare operation synchronously. It takes dn, the DN of the entry upon which to
perform the compare, and attr and value, the attribute type and value to compare to those found in the entry. It returns an LDAP error
code, which will be LDAP_COMPARE_TRUE if the entry contains the attribute value and LDAP_COMPARE_FALSE if it does not. Otherwise, some
error code is returned.
The ldap_compare() routine is used to perform an LDAP compare operation asynchronously. It takes the same parameters as ldap_compare_s(),
but returns the message id of the request it initiated. The result of the compare can be obtained by a subsequent call to ldap_result(3).
ERRORS
ldap_compare_s() returns an LDAP error code which can be interpreted by calling one of ldap_perror(3) and friends. ldap_compare() returns
-1 if something went wrong initiating the request. It returns the non-negative message id of the request if things went ok.
BUGS
There is no way to compare binary values, but there should be.
SEE ALSO
ldap(3), ldap_error(3)
ACKNOWLEDGEMENTS
OpenLDAP is developed and maintained by The OpenLDAP Project (http://www.openldap.org/). OpenLDAP is derived from University of Michigan
LDAP 3.3 Release.
OpenLDAP 2.1.X RELEASEDATE LDAP_COMPARE(3)