[PATCH] allow empty files creation with install

[joris dedieu]

This patch add a -t switch to install(3). This is a small feature for
lazy sysadmins.

before :

touch /usr/home/foo/.history /usr/home/foo/.bash_history
chown foo /usr/home/foo/.history /usr/home/foo/.bash_history
chmod 600 /usr/home/foo/.history /usr/home/foo/.bash_history
chflags sappend /usr/home/foo/.history /usr/home/foo/.bash_history

after :

install -o foo -g foo -m 600 -f sappend /usr/home/foo/.history
/usr/home/foo/.bash_history


Regards,
Joris
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