cget

#!/bin/bash
# Download a single file using curl; usage: cget URL [localfilename].
# Like wget (and different from normal curl) it's not necessary to specify
# options; if no explicit localfilename is specified, the filename part of
# the URL is used.
# If the file with the specified name already exists, it is assumed to be an
# incomplete download; the rest of the file will be downloaded and appended.
OPTS=(--compressed -C - --retry 5 -f)
if (($# == 1 )); then
    # Calculate outname ourselves instead of using curl's -O since curl
    # doesn't resolve percent-encoding in URLs.
    outname=$(basename "$1" | echo -e "$(sed 's/+/ /g; s/%/\\x/g')")
elif (($# == 2 )); then
    outname="$2"
else
    echo "Usage: cget URL [localfilename]"
    exit 1
fi
echo "Downloading $1 to '$outname'"
curl "${OPTS[@]}" -o "$outname" "$1" &&
echo "Downloaded $1 to '$outname'" || echo "Couldn't download $1"