feat(linux): add shell info

src/linux/linux.zig

@@ -53,3 +53,20 @@ pub fn getSystemUptime() !SystemUptime {
         .minutes = @as(i8, @intFromFloat(minutes)),
     };
 }
+
+pub fn getShell(allocator: std.mem.Allocator) ![]u8 {
+    const shell = try std.process.getEnvVarOwned(allocator, "SHELL");
+
+    var child = std.process.Child.init(&[_][]const u8{ shell, "--version" }, allocator);
+
+    child.stdout_behavior = .Pipe;
+    child.stderr_behavior = .Pipe;
+
+    try child.spawn();
+
+    const output = try child.stdout.?.reader().readAllAlloc(allocator, 1024 * 1024);
+
+    _ = try child.wait();
+
+    return output;
+}