Shell: When a command is terminated by a signal, print signal descrip…

…tion.

Previously we were only printing the signal number (except for SIGINT.)

Shell/main.cpp

@@ -405,14 +405,7 @@ static int run_command(const String& cmd)
  return WEXITSTATUS(wstatus);
  } else {
  if (WIFSIGNALED(wstatus)) {
- switch (WTERMSIG(wstatus)) {
- case SIGINT:
- printf("Interrupted\n");
- break;
- default:
- printf("Terminated by signal %d\n", WTERMSIG(wstatus));
- break;
- }
+ puts(strsignal(WTERMSIG(wstatus)));
  } else {
  printf("Exited abnormally\n");
  return 1;