send.k1k.in: Easy file sharing from the command line
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Upload:
  $ curl --upload-file ./hello.txt https://send.k1k.in/hello.txt
  https://send.k1k.in/AbCdEfGhIj/hello.txt

Shell function (add to .bashrc / .zshrc):
  transfer() {
    basefile=$(basename "$1" | sed -e 's/[^a-zA-Z0-9._-]/-/g')
    curl --progress-bar --upload-file "$1" "https://send.k1k.in/$basefile"
  }

Files expire after 7 days.