串口编程时，出现Cannot open /dev/ttyS0 Permission denied解决
在ubuntu14.04上，通过qt creator进行串口编程时出现：trying to open file "/dev/ttyS0"
could not open file: 权限不够
port open is false
jgc> ls -al /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 Mar 23 21:00 /dev/ttyS0
jgc> echo xyzzy >/dev/ttyS0
bash: /dev/ttyS0: Permission denied
解决方法如下：
jgc> id -Gn
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jgc> sudo adduser jgc dialout
password for jgc:
Adding user jgc to group dialout
Done.
>
jgc> id -Gn
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