Let's say I have three arrays that look like the following:
a=(banana apple grape)
b=(1 2 3)
c=(yellow red purple)
If I wanted to loop through such that each index of each variable is matched, how would I do this? For example, I would want something like the following:
for i in range(0,len(a))
do
echo "$a[i] $b[i] $c[i]"
done
such that the results would be:
banana 1 yellow
apple 2 red
grape 3 purple
The syntax to access array elements is ${array[index]}.
for ((i=0 ; i < ${#a[@]} ; ++i)) ; do
echo "${a[i]} ${b[i]} ${c[i]}"
done
You can use seq to simulate Python's range:
for i in $(seq 1 ${#a[@]}) ; do
echo "${a[i-1]} ${b[i-1]} ${c[i-1]}"
done
where ${#array[@]} returns the size of the array.
seq, I'm not sure there's any compelling respect in which it can be argued to be better than the C-style for syntax used above it.
scalar @array and $#array. In bash, you can use seq 0 $((${#a[@]}-1)), but it becomes really hard to read :-)