🔍 test: Validate with shellcheck.

Author: make-github-pseudonymous-again

Makefile

@@ -1,3 +1,5 @@
+.PHONY: install install-bin test
+
 PREFIX ?= /usr
 BINDIR = $(PREFIX)/bin
 
@@ -7,3 +9,6 @@ install-bin:
 	@echo -e '\033[1;32minstalling scripts...\033[0m'
 	mkdir -p "$(DESTDIR)$(BINDIR)"
 	install -Dm755 bin/* "$(DESTDIR)$(BINDIR)"
+
+test:
+	grep -l '^#!/usr/bin/env *sh' bin/* | xargs shellcheck --color