List all samples in a raw data directory (single line, multiple line list or count them)

list_samples.sh

#!/bin/bash

list_samples() {
    local dir="$1"
    local mode="${2:-line}"
    local samples=$(ls -1 "$dir" | awk -F'_' '{print $1}' | sort -uV)

    case "$mode" in
        line)
            echo "$samples" | paste -sd ' ' -
            ;;
        list)
            echo "$samples"
            ;;
        count)
            echo "$samples" | wc -l
            ;;
        *)
            echo "Invalid mode. Use 'line', 'list', or 'count'."
            exit 1
            ;;
    esac
}

export -f list_samples

# Example usage:
# ./script.sh /path/to/directory line
# ./script.sh /path/to/directory list
# ./script.sh /path/to/directory count