安装完kermit后，每次直接执行kermit都会提示“/dev/ttyUSB0: Permission denied”：
gouwa@lurk:~$ kermit
?OpenSSL libraries do not match required version:
C-Kermit built with OpenSSL 1.0.0e
Version found OpenSSL 1.0.1 14
OpenSSL versions prior to 1.0.0 must be the same.
Set LD_LIBRARY_PATH for OpenSSL 1.0.0e
Or rebuild C-Kermit from source on this computer to make versions agree.
C-Kermit makefile target: linux+krb5+openssl
Or if that is what you did then try to find out why
the program loader (image activator) is choosing a
different OpenSSL library than the one specified in the build.
All SSL/TLS features disabled.
/dev/ttyUSB0: Permission denied # 这里提示权限问题
?SET SPEED has no effect without prior SET LINE
Sorry, you must SET LINE or SET HOST first
C-Kermit 9.0.302 OPEN SOURCE:, for Linux+SSL+KRB5 (64-bit)
Copyright (C),
Trustees of Columbia University in the City of New York.
Type ? or HELP for help.
(/home/gouwa/) C-Kermit>
查看串口设备文件后发现，/dev/ttyUSB0是属于root用户，dialout组:
crw-rw---- 1 root dialout 188, 0 Sep 24 10:03 /dev/ttyUSB0
gouwa@lurk:~$
因此，这里的默认用户(gouwa)是没有权限打开的。解决办法很简单，就是把你的用户
添加到组dialout就行了：
gouwa@lurk:~$ sudo usermod -a -G dialout gouwa
然后，重新logout注销一下，再重新登入就可以直接使用kermit了。
当然，也可以通过如下方式修改设备文件的UID：
gouwa@lurk:~$ sudo chown gouwa /dev/ttyUSB0
这样修改的弊端就是，每次开机都要手动设置一遍，而且，插拔串口后也要重新设置。
附，kermrc配置文件：
gouwa@lurk:~$ cat .kermrc
set line /dev/ttyUSB0
set speed 115200
set carrier-watch off
set handshake none
set flow-control none
robust
set file type bin
set file name lit
set rec pack 1000
set send pack 1000
set window 5
c
gouwa@lurk:~$