Termux doesn't have a /bin/sh. So we needto use $SHELL. Keep /bin/sh as much as possible.
Those tests don't actually need bash. Just use common shebang.
* grub-core/commands/tr.c: New file. * grub-core/Makefile.core.def: Build rules for new module. * tests/grub_cmd_tr.in: New test. * Makefile.util.def: Build rules for new test.