On man mkdir
-m, --mode=MODE
set file mode (as in chmod), not a=rwx - umask
-p, --parents
no error if existing, make parent directories as needed
do warn that --mode doesn't affect any parents created.
$ mkdir --mode 700 -p /tmp/g/h/i
$ find /tmp/g -ls
55795 0 drwxr-xr-x 3 jidanni jidanni 60 Jan 7 23:30 /tmp/g
55796 0 drwxr-xr-x 3 jidanni jidanni 60 Jan 7 23:30 /tmp/g/h
55797 0 drwx------ 2 jidanni jidanni 40 Jan 7 23:30
/tmp/g/h/i
Also warn on (info "(coreutils) mkdir invocation") more directly. Thanks.
