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Iterating through two arrays in a single loop

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# 1  
Old 07-19-2011
Iterating through two arrays in a single loop
Hey everyone.
Is it possible to use two arrays in a loop?
Basically what I am trying to do is iterate through the elements in an array, and, based on a condition, use the current position in the array to point to that index in the array. Here's the loop structure I'm looking for:

geoDirs=("/logsync/GEO/DBS" "/logsync/GEO/NS")
localDirs=("/logsync/DBS" "/logsync/NS")

Code:
for i in "${geoDirs[@]}"
        do
                if [ "$(ls -A $i)" ]
                        then
                                echo "Take action on $i"
                                echo "Also take action on ${localDirs[@]}"
                fi
        done

I know that code doesn't work, I'm just trying to figure out how to make use of the loop to iterate through both geoDirs and localDirs.

---------- Post updated at 03:07 PM ---------- Previous update was at 03:02 PM ----------

I have a temporary workaround for now, but is there a more elegant solution than:

Code:
geoDirs=("/logsync/GEO/DBS" "/logsync/GEO/NS")
localDirs=("/logsync/DBS" "/logsync/NS")
counter=0

for i in "${geoDirs[@]}"
        do
                if [ "$(ls -A $i)" ]
                        then
                                echo "Take action on $i"
                                echo "Also take action on ${localDirs[$counter]}"
                fi
        counter=$((counter+1))
        done

# 2  
Old 07-19-2011
You can loop through indeces of array like this:
Code:
for i in `seq 0 ${#geoDirs[@]}` ;  do
   echo $i  #i=0,1,2,3...
   #process ${geoDirs[$i]}
   #process ${localDirs[$i]}
done

${#array[@]} return number of elements of array
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