Hang when run command with /dev/console

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http://www.unix.com – hi guys, I don't know why I run this command: echo a>/dev/console It is not responsed from console and hang. If I run echo a>/dev/null, it is OK. here it is the console file: mcl1101 root#ls -ltr /dev/console lrwxrwxrwx 1 root other 30 Aug 18 2009 /dev/console -> ../devices/pseudo/cn@0:console mcl1101 root#ls -ltr /devices/pseudo/cn@0:console crw--w---- 1 root tty 0, 0 Dec 30 22:52 /devices/pseudo/cn@0:console Can anyone help me? thanks you a lot. Br. (HowTos)