How to list all subdirectories of a parent directory using julia

When working with directories in Julia, there are multiple ways to list all subdirectories of a parent directory. In this article, we will explore three different approaches to solve this problem.

Option 1: Using the readdir function

The readdir function in Julia returns an array of all files and directories in a given path. By iterating over the array and checking if each entry is a directory, we can list all subdirectories of a parent directory.


function listSubdirectories(parentDir)
    subdirectories = []
    entries = readdir(parentDir)
    for entry in entries
        if isdir(joinpath(parentDir, entry))
            push!(subdirectories, entry)
        end
    end
    return subdirectories
end

To use this function, simply pass the parent directory path as an argument:


parentDir = "/path/to/parent/directory"
subdirectories = listSubdirectories(parentDir)
println(subdirectories)

Option 2: Using the walkdir function

The walkdir function in Julia recursively traverses a directory tree and returns an iterator over all files and directories. By filtering the iterator to only include directories, we can list all subdirectories of a parent directory.


function listSubdirectories(parentDir)
    subdirectories = []
    for entry in walkdir(parentDir)
        if isdir(entry)
            push!(subdirectories, entry)
        end
    end
    return subdirectories
end

Similar to option 1, you can use this function by passing the parent directory path as an argument:


parentDir = "/path/to/parent/directory"
subdirectories = listSubdirectories(parentDir)
println(subdirectories)

Option 3: Using the Glob.jl package

The Glob.jl package provides a convenient way to search for files and directories using glob patterns. By specifying the parent directory path and the glob pattern for directories, we can list all subdirectories of a parent directory.

First, make sure you have the Glob.jl package installed by running the following command:


using Pkg
Pkg.add("Glob")

Once the package is installed, you can use the following code to list all subdirectories:


using Glob

parentDir = "/path/to/parent/directory"
subdirectories = glob("*/", parentDir)
println(subdirectories)

After exploring these three options, it is clear that using the Glob.jl package provides a more concise and efficient solution. It simplifies the code and eliminates the need for manual iteration or recursion. Therefore, option 3 is the recommended approach to list all subdirectories of a parent directory in Julia.

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