minicom issues: minicom Device /dev/ttyUSB0 is locked. & can't show input

fedora20 minicom 2.6

issues:

1. can't show input:

    reboot device, for example STB.

2. Device /dev/ttyUSB0 is locked

    rm the lock file, for example:  rm /var/lock/lockdev/LCK..ttyUSB0 /  rm /var/lock/lockdev/*

 

    通常是因为minicom上次使用时没有正常退出，系统自动在目录/var/lock中生成了lockfile而导致，只要进入/var/lock，删除lockfile，minicom又可以正常启动了。