Raspberry显示当前CPU频率

Raspberry Pi ArchLinux的vcgencmd安装在/opt/vc/bin/下面，需要自己把/opt/vc/bin 加到PATH里面：

export PATH=/opt/vc/bin:$PATH

或者直接这样用：

/opt/vc/bin/vcgencmd get_config arm_freq
# 列出所有命令
/opt/vc/bin/vcgencmd commands
# vcgencmd 版本
/opt/vc/bin/vcgencmd version

LIFE WITH PI