Bash script that uploads a file or a zipped directory to keep.sh

transfer.sh

#!/bin/sh
# A script with functions to add to .bashrc

# Uploads a file or a zipped directory to `keep.sh`
# see https://free.keep.sh
# usage: transfer hello.txt
# requirements: curl
# based on transfer.sh old, not-working anymore script.
# A free bucket is provided by keep.sh for public use. Files are limited to 500MB and are deleted 24 hours after upload.
transfer() {
  if [ $# -eq 0 ]; then
    echo "No arguments specified.\nUsage:\n transfer <file|directory>\n ... | transfer <file_name>" >&2
    return 1
  fi
  file="$1"
  file_name=$(basename "$file")
  if [ -d "$file" ]; then # True if the FILE exists and is a directory.
    file_name="$file_name.zip"
    (cd "$file" && zip -r "../$file_name" .) && curl --progress-bar --upload-file "$file_name" "https://free.keep.sh"
  else 
    curl --progress-bar --upload-file "-" "https://free.keep.sh"
  fi  
}