RexCommandsRun 执行一个远程命令

RexCommandsRun   执行一个远程命令:使用这个模块 你可以运行一个命令: task "ppm", group=>"myservers", sub {   my $output = run "pwd;ls -l";    say $output;   };[root@node01 Rex]# rex ppm[2017-05-01 11:52:46] INFO - Running task ppm on 192.168.137.3/root导出的函数:这个格式 会执行 $command  使用给定的参数$arguments. 参数必须是一个数组引用,参数run($command_description, command => $command, %options)run($command_description, command => $command, %options)此函数会执行给定的命令和返回输出,在标量上下文 它返回原始输出,在一个列表上下文 他返回列表输出  命令的退出值是存在$?变量 task "uptime", group=>"myservers", sub {   say run "uptime";   run "uptime", sub {     my ($stdout, $stderr) = @_;     my $server = Rex::get_current_connection()->{server};     say "[$server] $stdout\n";   };   print "---------------\n";   print $?;   print "---------------\n"; };[root@node01 Rex]# rex uptime[2017-05-01 12:00:28] INFO - Running task uptime on 192.168.137.3 03:02:48 up 2 days, 23:30,  2 users,  load average: 0.00, 0.00, 0.00[192.168.137.3]  03:02:48 up 2 days, 23:30,  2 users,  load average: 0.00, 0.00, 0.00---------------0---------------[2017-05-01 12:00:39] INFO - All tasks successful on all hosts task "uptime", group=>"myservers", sub {   say run "uptime";   run "xx", sub {     my ($stdout, $stderr) = @_;     my $server = Rex::get_current_connection()->{server};     say "[$server] $stdout\n";   };   print "---------------\n";   print $?;   print "---------------\n"; };[root@node01 Rex]# rex uptime[2017-05-01 12:01:15] INFO - Running task uptime on 192.168.137.3 03:03:35 up 2 days, 23:30,  2 users,  load average: 0.00, 0.00, 0.00[192.168.137.3] ---------------127---------------[2017-05-01 12:01:26] INFO - All tasks successful on all hosts例子：如果你要运行一个命令在指定的情况下, 你可以队列命令行 当你需要运行它时通知它如果你要运行一个命令如果另外的命令成功或者失败,你可以使用only_if或者unless 选项: task "ppm", group=>"myservers", sub { my $count=  run "ps -ef | grep -i mysql | wc -l"; say $count;   };[root@node01 Rex]# rex ppm[2017-05-01 12:15:19] INFO - Running task ppm on 192.168.137.34[2017-05-01 12:15:30] INFO - All tasks successful on all hosts[root@node01 Rex]# can_run($command)这个函数检查如果一个命令行在一个path是可用的,你可以指定多个命令行,第一个找到的命令会被返回； task "uptime",group=>"myservers",  sub {   if( my $cmd = can_run("xx", "uname -a") ) {     say run $cmd;   } };[root@node01 Rex]# rex uptime[2017-05-01 12:22:05] INFO - Running task uptime on 192.168.137.3Linux[2017-05-01 12:22:16] INFO - All tasks successful on all hosts[root@node01 Rex]#