bug#29390: chmod man page - clear setuid/setgid with numerical value

[Oliver Isaac]

Hello,

There is an incorrect assertion made in the chmod man page:

Under the setuid/setgid header it says, "you can set (but not clear) the bits 
with a numeric mode"

This is not entirely true. If you prefix your numeric mode with a 0 then it 
will work:

e.g.:

touch myfile
chmod 644 myfile
ls -l myfile
chmod g+s myfile
Is -l myfile
chmod 00644 myfile
is -l myfile


This simple test shows that you can clear the uid/gid bits with numeric mode 
which is especially useful in scripts.

An update to the man page to clarify this would be helpful. 

Thanks,
Oliver