rex 怎么检查远程运行命令的退出值？

怎么检查远程运行命令的退出值？

Rex 会把远程运行的 run 或者 shell_block 语句的退出值存入 $? 变量。

task "task2", group=>"myservers", sub {
  my $output = run "df -h";
  say '----------------------';
  say $?;
  say '----------------------';
  say $output;
};
[root@node01 Rex]# rex task2
[2017-04-30 14:09:10] INFO - Running task task2 on 192.168.137.3
----------------------
0
----------------------
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3        19G   11G  7.1G  60% /
tmpfs           497M     0  497M   0% /dev/shm
/dev/sda1       194M   29M  155M  16% /boot
[2017-04-30 14:09:22] INFO - All tasks successful on all hosts





task "task2", group=>"myservers", sub {
  my $output = run "ld";
  say '----------------------';
  say $?;
  say '----------------------';
  say $output;
};
[root@node01 Rex]# rex task2
[2017-04-30 14:09:55] INFO - Running task task2 on 192.168.137.3
----------------------
1
----------------------