Shell Programming and Scripting

Dear all,
I have kind of used both the awk/sed command and found them really useful.
But at the necessity I am having right now, I need help.
Actually, I would like to do the following in file script.sh

Code:

  
PATH535[1]="/eos/uscms/store/user/pooja04//analysis2012/535/mc/summer12/002/tt/"

there is whole script which works all fine, now my present task is to somehow read the RED LINE , and
change the "tt" to various varaible.
So I have something in mind as:

Code:

GREP[1]="ttbar"
GREP[2]="DYJets50"
GREP[3]="zgamma"
GREP[4]="mJetA"
GREP[5]="mJetB"

for FileNameIndx in "${GREP[@]}"
      do
        change the tt  in script.sh to GREP[1]
        do something ......
      done

Can somebody help me with the BLUE color command, how shall I implement that?

thanks in advance
emily

Something like:

Code:

sed -i "/^PATH535/s#/tt/#/${GREP[1]}/#g" script.sh

(if your sed doesn't support -i you could use a temporary file)

EDIT: If you want an awk solution then you could have something like:

Code:

awk -F/ -vnewdir=${GREP[1]} '/^PATH535/ {$NF=newdir}1' OFS=/ script.sh

(assuming you know tt is always the last element in the path)

Thank
emily