Hello frends!
I got solution for my problem. Now i gave full path in script,
PGUSER=postgres /usr/local/pgsql/bin/pg_dumpall > /path/to/backup_date.sql
Now its working for me.
Already my $PATH contains /usr/local/pgsql/bin .
Then , why it happened?
Is there any PATH details need for crond?
regards
Bala