RUN命令说明

备忘单:


执行一个命令解析它的输出:

run($command, %options)

运行一个远程命令返回它的输出

task "test01", sub {
   my $out = run "pwd",
   cwd=>'/home/mqm/perl/';
   say $out;
};

cmd --  命令的工作目录

only_if - Executes the command only if the condition completes successfully.

执行命令只有条件成功,才会执行run

[root@node01 my-first-rex-project]# rex -H 192.168.137.2 test02
[2019-06-18 12:55:02] INFO - Running task test02 on 192.168.137.2
$VAR1 = {
          'auto_die' => 0
        };
idd: Command not found.error-------------------
127
-------------------
[2019-06-18 12:55:02] INFO - All tasks successful on all hosts


unless - Executes the command only unless the condition completes successfully.


[root@node01 my-first-rex-project]# rex -H 192.168.137.2 test02
[2019-06-18 12:57:21] INFO - Running task test02 on 192.168.137.2
$VAR1 = {
          'auto_die' => 0
        };
idd: Command not found.error$VAR1 = {
          'auto_die' => undef,
          'unless' => 'idd'
        };
/root
[2019-06-18 12:57:22] INFO - All tasks successful on all hosts
[root@node01 my-first-rex-project]# 



task "task03", sub {
   run "extract-something",
     command     => "pwd",
     only_notified => TRUE;
};



If you only want to run a command in special cases, you can queue the command
and notify it when you want to run it.

 task "prepare", sub {
   run "extract-something",
     command     => "tar -C /foo -xzf /tmp/foo.tgz",
     only_notified => TRUE;

   # some code ...

   notify "run", "extract-something";  # now the command gets executed
 };