check which OS we're on

check_os.zig

@@ -0,0 +1,16 @@
+const std = @import("std");
+const builtin = @import("builtin");
+
+pub fn main() !void {
+    switch (builtin.os.tag) {
+        .windows => {
+            std.debug.print("hello windows OS: {}\n", .{builtin.os.tag});
+        },
+        .linux => {
+            std.debug.print("hello linux-based OS: {}\n", .{builtin.os.tag});
+        },
+        else => {
+            std.debug.print("hello mystery OS: {}\n", .{builtin.os.tag});
+        },
+    }
+}