Sudo Problem (File permissions)

[Todd C. Miller]

My guess is that on your project PC the file already existed
and so when you ran the command with sudo nmap overwrote the
existing file rather than creating a new one as root.

If you need the output file to be owned by the user
running sudo and not root the simplest thing is probably
to use '-' for the output filename and use shell redirection
to make the output go to a file.  Because the redirection is
done by the shell (and not sudo) the resulting file will
be owned by the user running sudo and not root.

E.g.

sudo nmap -sP -n 192.168.1.0/24 -oG - > \
    /home/hippie/projektarbeit/java/activeHosts.txt

Alternately you could just have your java program create
/home/hippie/projektarbeit/java/activeHosts.txt if it
does not exist before running sudo.

 - todd