minicom: cannot open /dev/ttyS0: Permission denied

ubuntu12.04上使用minicom看串口信息总是提示"Cannot open /dev/ttyS0: Permission denied",一直用着sudo来解决。

今天google了一翻得到答案：

由于tty属于"dialout"组别，将用户加入该组别即可。

解决方案:使用命令

sudo gpasswd --add user_name dialout

logout\login后ok

yangzhiwen@yzw:~$ sudo groups yangzhiwen

yangzhiwen : yangzhiwen adm cdrom sudo dip plugdev lpadmin sambashare

yangzhiwen@yzw:~$ sudo gpasswd -a yangzhiwen dialout

Adding user yangzhiwen to group dialout

yangzhiwen@yzw:~$ sudo groups yangzhiwen

yangzhiwen : yangzhiwen adm dialout cdrom sudo dip plugdev lpadmin sambashare

yangzhiwen@yzw:~$logout

yangzhiwen@yzw:~$minicom

yangzhiwen@yzw:~$