curl.1: mention quoting in the URL section

or you can get sequences of alphanumeric series by using [] as in:

  ftp://ftp.numericals.com/file[1-100].txt

  ftp://ftp.numericals.com/file[001-100].txt    (with leading zeros)

  ftp://ftp.letters.com/file[a-z].txt

Nested sequences are not supported, but you can use several ones next to each

letter:

  http://www.numericals.com/file[1-100:10].txt

  http://www.letters.com/file[a-z:2].txt

When using [] or {} sequences when invoked from a command line prompt, you

probably have to put the full URL within double quotes to avoid the shell from

interfering with it. This also goes for other characters treated special, like

for example '&', '?' and '*'.

If you specify URL without protocol:// prefix, curl will attempt to guess what

protocol you might want. It will then default to HTTP but try other protocols

based on often-used host name prefixes. For example, for host names starting