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The shell tries to subsitute $SID_. Enclose your variablenames in curly braces.
#!/usr/bin/ksh
SID=ffin1
wdate=`date '+%m%d%y'`
sqlplus /nolog <<-EOF
conn / as sysdba
alter database backup...

Do you no longer want that line you were asking about modified, then? I still don't have enough information to give you an answer about it.

typeset -i mHHMM=`date +%H%M` You don't need to...

s - substitute
# - chosen seperator for s (most often is '/' in other examples)
"user@wherever" - string to be matched
"user@whenever" - string to replace matched string
g - global change
<...