Mktemp

wikipedia:mktemp Create a temporary file or directory, safely, and print its name.

mktemp 

    -p tmpdir, --tmpdir[=tmpdir]
            Use tmpdir for the -t flag if the TMPDIR environment variable is
            not set.  Additionally, any provided template arguments will be
            interpreted relative to the path specified as tmpdir.  If tmpdir
            is either empty or omitted, then the TMPDIR environment variable
            will be used.

mktemp -u
/tmp/

See also

• mktemp, mkfifo
• tmp, /tmp/, mktemp, tmpfs, TMPDIR

https://www.gnu.org/software/autogen/mktemp.html