``` $ shellcheck /usr/share/xfce4/settings/appearance-install-theme .... In /usr/share/xfce4/settings/appearance-install-theme line 109: tmpdir="/tmp/tmp.$$.$RANDOM" ^-----^ SC3028 (warning): In POSIX sh, RANDOM is undefined. .... ``` `$RANDOM` was introduced with https://gitlab.xfce.org/xfce/xfce4-settings/-/commit/ed1083bd59d943e59e6d510c33c1f17879d7082d#6be89d9117d406697cbb7b26fbcac10ceb7c75f6_4_61, which is 11 years old. So seems to be either not critical, or an unused code-path