#!/bin/bash
if [ $1 = "REP1" ]
then
   liste=/data/folder1
   echo "LISTEREP1 :" $liste
elif  [ $1 = "REP2" ]
then
    liste=/data/folder2
    echo "LISTEREP2 :"$liste
fi
liste_rep=$liste/$2/$3
echo "DO LOOP FOR REP1 AND REP2 : :"$1 $liste_rep
for printlist in $list_rep
do
   echo "SHOULD LOOP_"$1":" $liste_rep
done

if [ $1 = "REP3" ]
then
   liste=/data2/folder3
   echo "LISTEREP3 :" $liste
elif  [ $1 = "REP4" ]
then
    liste=/data2/folder4
    echo "LISTEREP4 :"$liste
fi
liste_rep=$liste/$2/$3
echo "DO LOOP FOR REP3 AND REP4 :"$1 $liste_rep
for printlist in $list_rep
do
   echo "SHOULD_LOOP_"$1":" $liste_rep
done
exit

Prompt $ ./test_decomp.sh REP1 a b
LISTEREP1 : /data/folder1
DO LOOP FOR REP1 AND REP2 :REP1 /data/folder1/a/b
DO LOOP FOR REP3 AND REP4 :REP1 /data/folder1/a/b

Prompt $ ./test_decomp.sh REP2 a b
LISTEREP2 :/data/folder2
DO LOOP FOR REP1 AND REP2 :REP2 /data/folder2/a/b
DO LOOP FOR REP3 AND REP4 :REP2 /data/folder2/a/b

Prompt $ ./test_decomp.sh REP3 a b
DO LOOP FOR REP1 AND REP2 :REP3 /a/b
LISTEREP3 : /data2/folder3
DO LOOP FOR REP3 AND REP4 :REP3 /data2/folder3/a/b

Prompt $ ./test_decomp.sh REP4 a b
DO LOOP FOR REP1 AND REP2 :REP4 /a/b
LISTEREP4 :/data2/folder4
DO LOOP FOR REP3 AND REP4 :REP4 /data2/folder4/a/b