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Full Discussion: String comparison in if statement
Top Forums Shell Programming and Scripting String comparison in if statement Post 302281969 by javathecat on Friday 30th of January 2009 12:38:45 AM
Old 01-30-2009
String comparison in if statement
Hi

Just trying to compare the following variables as a condition in an 'if' statement.

Code:
ZERODATA="unidentified 0 b (0%)"
DATA=`sed -n "${dln} p" mpck2.out`

...

if [ "$DATA" != "$ZERODATA" ]
then
...

The problem I'm getting is that the condition always comes out true and doesn't appear to compare them properly. If I use the 'ne' operator I get an error.

(All I actually want to know is if the string DATA contains the substring '0 b (0%)' and use that in the 'if' statement but I just want to get the match for now to simplify the problem.)

Is anyone able to tell me why these would not compare correctly?
 

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LEARN ABOUT OPENDARWIN

ldap_compare_s

LDAP_COMPARE(3)                                              Library Functions Manual                                              LDAP_COMPARE(3)

NAME

       ldap_compare, ldap_compare_s, ldap_compare_ext, ldap_compare_ext_s - Perform an LDAP compare operation.

LIBRARY

       OpenLDAP LDAP (libldap, -lldap)

SYNOPSIS

       #include <ldap.h>

       int ldap_compare_ext(
              LDAP *ld,
              char *dn,
              char *attr,
              const struct berval *bvalue,
              LDAPControl **serverctrls,
              LDAPControl **clientctrls,
              int *msgidp );

       int ldap_compare_ext_s(
              LDAP *ld,
              char *dn,
              char *attr,
              const struct berval *bvalue,
              LDAPControl **serverctrls,
              LDAPControl **clientctrls );

DESCRIPTION

       The  ldap_compare_ext_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 description and value to compare to those found in the entry.  It returns a code,
       which  will be LDAP_COMPARE_TRUE if the entry contains the attribute value and LDAP_COMPARE_FALSE if it does not.  Otherwise, an error code
       is returned that indicates the nature of the problem.  See ldap(3) for details.

       The ldap_compare_ext() routine is used to perform an LDAP compare operation asynchronously.  It takes  the  same  parameters  as  ldap_com-
       pare_ext_s(),  but  provides the message id of the request it initiated in the integer pointed to msgidp.  The result of the compare can be
       obtained by a subsequent call to ldap_result(3).

       Both routines allow server and client controls to be specified to extend the compare request.

DEPRECATED INTERFACES

       The routines ldap_compare() and ldap_compare_s() are deprecated in favor of ldap_compare_ext() and ldap_compare_ext_s(), respectively.

       Deprecated interfaces generally remain in the library.  The macro LDAP_DEPRECATED can be defined to a non-zero value  (e.g.,  -DLDAP_DEPRE-
       CATED=1) when compiling program designed to use deprecated interfaces.  It is recommended that developers writing new programs, or updating
       old programs, avoid use of deprecated interfaces.  Over time, it is expected that documentation (and, eventually, support)  for  deprecated
       interfaces to be eliminated.

SEE ALSO

       ldap(3), ldap_error(3)

ACKNOWLEDGEMENTS

       OpenLDAP  Software  is  developed and maintained by The OpenLDAP Project <http://www.openldap.org/>.  OpenLDAP Software is derived from the
       University of Michigan LDAP 3.3 Release.

OpenLDAP                                                            2017/06/01                                                     LDAP_COMPARE(3)
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