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You can use the FileChannel provided by Nextflow to obtain the list of files in a directory.

Here's an example:

// Define a channel of files in a directory
FileChannel.fromPath('/path/to/directory/*') 

// Iterate over the channel and print the file names
.map{ file ->
    file.name
}

This will return a list of all the file names in the specified directory. You can also modify the fromPath() argument to include a specific extension or a regex pattern to filter the files.