gistfile1.txt

function cclip {
    for file in "$@"; do
        echo "=== $file ==="
        cat "$file"
        echo
    done | xclip -selection clipboard
}

function dclip {
    find "$(pwd)" -type f -not -path '*/\.*' -print0 | xargs -0 -I {} bash -c '
        echo "=== {}"
        cat "{}"
        echo
    ' | xclip -selection clipboard
}