Linux shell for语句的使用

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[22:26:42 root@libin3 libin]# cat libin6 rhcsa rhce rhca hcia libin1 hcip libin2 hcie libin3     [22:26:52 root@libin3 libin]# for i in `cat libin6`;do ping -c 1 $i;done ping: rhcsa: 未知的名称或服务 ping: rhce: 未知的名称或服务 PING rhca.com (165.160.15.20) 56(84) bytes of data.   --- rhca.com ping statistics --- 1 packets transmitted, 0 received, 100% packet loss, time 0ms   PING hcia.com (47.52.43.105) 56(84) bytes of data. 64 bytes from 47.52.43.105 (47.52.43.105): icmp_seq=1 ttl=128 time=48.7 ms   --- hcia.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 48.700/48.700/48.700/0.000 ms ping: libin1: 未知的名称或服务 PING hcip.com (34.102.136.180) 56(84) bytes of data.   --- hcip.com ping statistics --- 1 packets transmitted, 0 received, 100% packet loss, time 0ms   PING libin2.com (107.149.111.15) 56(84) bytes of data. 64 bytes from 107.149.111.15 (107.149.111.15): icmp_seq=1 ttl=128 time=191 ms   --- libin2.com ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 191.414/191.414/191.414/0.000 ms ping: hcie: 未知的名称或服务 ping: libin3: 未知的名称或服务