Thanks for your help, Well i did install YAML in my perl and i run the script

eval 'exec perl $0 ${1+"$@"}'  # -*- perl -*-
if $running_under_some_shell;
use YAML;
print "Path is   ";
print $ENV{PATH};
%ENV = %{ Load qx{.rcfile; perl -MYAML -e 'print Dump \\%ENV'} };
print "Path is now ";
print $ENV{PATH};
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where my .rcfile contains

#!/bin/csh -f 
source /usr/applis/common/sourcefiles/solaris/unicad_24
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But when i run the perl script , i get the error

--- !perl/YAML::Error
code: YAML_LOAD_USAGE
msg: 'usage: YAML::Load($yaml_stream_scalar)'
...
 at test.pl line 8
Path is   /usr/applis/perl/5.005_03/bin: /usr/applis/common/bin:/usr/a
+pplis/common/bin: /usr/bin:.:/usr/dt/bin:/usr/openwin/bin: /bin:/usr/
+ucb:/usr/local/bin:/usr/applis/common/bin: .:/home/rishis:/home/rishi
+s/bin:/usr/local/bin: .:/home/rishis:/home/rishis/bin:/usr/local/bin:
+ .:/home/rishis:/home/rishis/bin:/usr/applis/unicad/24/Ukernel
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As i am a newbee to YAML i am unable to figure the problem THanks for your help in advance!!!

Edited by Chady -- added code tags (and the spaces in the path list so that it wraps)