Why "setenv" command is not recognised in this bash version.

[Nagunuri Sridhar]

Configuration Information [Automatically generated, do not change]:
Machine: sparc
OS: solaris2.5.1
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DHOSTTYPE='sparc' 
-DOSTYPE='solaris2.5.1' -DMACHTYPE='sparc-sun-solaris2.5.1' -DSHELL  
-DHAVE_CONFIG_H -DSunOS5  -I. -I. -I./lib -g -O2
uname output: SunOS hurin.trillium.com 5.5.1 Generic_103640-31 sun4m sparc 
SUNW,SPARCstation-5
Machine Type: sparc-sun-solaris2.5.1

Bash Version: 2.01
Patch Level: 0
Release Status: release

Description:
 When I do "eval `resize`" command on the command line, it gives error saying 
that setenv command not found. The previous versions of bash did not give this 
error. Can u please tell me the reason for this.
Thanks..

Repeat-By:
   Just Type eval `resize`.. the problem would repeat

Fix:
        [Description of how to fix the problem.  If you don't know a
        fix for the problem, don't include this section.]