run an interactive shell

This causes shells like bash and zsh to load basic configuration where most custom aliases etc are stored

src/main.c

@@ -155,7 +155,7 @@ int read_command(size_t max_to_show, const char *command, size_t *count, size_t
  abort_ltz(dup(child_stdout[1]));
  close(2);
  abort_ltz(dup(child_stderr[1]));
- execl(shell, shell, "-c", command, NULL);
+ execl(shell, shell, "-ic", command, NULL);
  }
 
  // parent