Problems eleminationg \ in a string

Hello,

in recipe I have

----[ '~/.tdtoops-procmail/BUSINESS_firms_microchip' ]------------------
<snip>
      TMPVAR7a=`formail -czx 'From:' |sed -e 's|<rssfeed4michelle@.*||' ; :`
      TMPVAR7a=`echo "${TMPVAR7a}" |tr '\t' ' ' |tr -s ' ' ; :`
      TMPVAR7a=`echo "${TMPVAR7a}" |sed -e 's| $||g' -e 's|^ ||g' ; :`
      TMPVAR7a=`echo "${TMPVAR7a}" |tr -d "'" |tr -d '"' ; :`
VERBOSE=on
      TMPVAR7a=`echo "${TMPVAR7a}" |tr -d '\\' ; :`
VERBOSE=off
      TMPVAR7b=`echo "${TMPVAR7a}" |tr ' ' '_' ; :`
      TMPVAR7b=`echo "${TMPVAR7b}" |sed -e 's|[()\\/."]|_|g' |tr -s '_' |sed -e 's|_$||g' ; :`
      :0
      * ? test "${TDTP_SHOW_RECIPES}" = "true"
      { LOG="${TMPVAR7b}${NL}" }
<snip>
------------------------------------------------------------------------

and the offending line is between the VERBOSE.

----[ '~/log/procmail/2010-12-20.log' ]---------------------------------
procmail: [16425] Mon Dec 20 20:32:28 2010
procmail: Executing "echo "${TMPVAR7a}" |tr -d '\' ; :"
tr: warning: an unescaped backslash at end of string is not portable
procmail: [16425] Mon Dec 20 20:32:28 2010
procmail: Assigning "TMPVAR7a=Graphics and LCD"
procmail: Assigning "VERBOSE=off"
------------------------------------------------------------------------


Question:   HOW TO ELIMINATE the \ in a string?

Thanks, Greetings and nice Day/Evening
    Michelle Konzack

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