Bash Loop iterate through each subdirectory

Below script entering into only first directory of path /root/Archive/EKS/data and making zip file, its not switching into the second path /root/Incoming/data, can you please someone correct me what I'm doing wrong here.

 #!/bin/bash
   startdir=(
"/root/Archive/EKS/data"
"/root/Incoming/data"
)

 cd "$startdir" || exit

    for sub_dir in */ ; do
        zip -r "${sub_dir%/}.zip" "$sub_dir"
    done

You should loop through the directories and use a subshell for the cd, something like:

#!/usr/bin/env bash

startdir=(
  "/root/Archive/EKS/data"
  "/root/Incoming/data"
)

for dir in "${startdir[@]}"; do
 (
   cd "$dir" || exit
   for sub_dir in */ ; do
      zip -r "${sub_dir%/}.zip" "$sub_dir"
   done
 )
done

• Without the subshell the cd would fail with an error message like, no such file or directory or something like that when it is done with the first directory.

• The outer for loop , loops through the top directories, while the inner one loops through the sub directories.

• Some more test needed, like if there are no subdirectories, what should happen?

• Consider using nullglob shell option just before/above the second for loop.

• See How Can I check if a directory is empty or not?

This assignment:

  startdir=(
"/root/Archive/EKS/data"
"/root/Incoming/data"
)

... sets $startdir to an array containing two pathnames. But this command:

cd "$startdir"

is only executed once, so it's not clear what you think it's going to do; automatically parallelize to process the whole array? Bash doesn't work that way. It just cd's to the first element in the array, since that's what $startdir without an index expands to (the same as the more explicit ${startdir[0]}.

What you need to do is loop over the array and repeat the commands for each element:

for dir in "${startdir[@]}"; do
(
  cd "$dir" || continue
  for subdir in */; do
    zip -r "${subdir%/}.zip" "$subdir"
  done
)
done

#!/bin/bash

startdirs=(
"/root/Archive/EKS/data"
"/root/Incoming/data"
)

for startdir in "${startdirs[@]}"; do
cd "$startdir" || exit

for sub_dir in */; do
    zip -r "${sub_dir%/}.zip" "$sub_dir"
done

done