Consider this working example:
# wget2 --no-clobber "running-gnu-parallel-while-files-exist" -O
"/root/stackoverflow.html" --base
"https://stackoverflow.com/questions/19571996/";
[0] Downloading
'https://stackoverflow.com/questions/19571996/running-gnu-parallel-while-files-exist'
...
File '/root/stackoverflow.html' already there; not retrieving.
HTTP response 200 OK
[https://stackoverflow.com/questions/19571996/running-gnu-parallel-while-files-exist]
if /root/stackoverflow.html already exists, it gets truncated.
It doesn't happen with wget 1.
My wget version is 2.0.0:
# wget2 --version
GNU Wget2 2.0.0 - multithreaded metalink/file/website downloader
+digest +https +ssl/gnutls +ipv6 +iri +large-file +nls -ntlm -opie -psl
-hsts
+iconv +idn +zlib -lzma -brotlidec -zstd -bzip2 -lzip -http2 -gpgme
