问题描述
我在 kermit 脚本中编写了以下内容以连接到我的串行设备：
I wrote the following in a kermit script to connect to my serial device:
#!/usr/bin/env kermit
set port /dev/ttyUSB8
set speed 115200
set carrier-watch off
set flow-control none
set prefixing all
set input echo on
上为所有
set输入回显加上前缀。现在，我想使它成为通用脚本，并希望从用户那里获取他想连接哪个端口的输入。因此，我认为将输入作为命令行参数是最好的方法。我以以下方式修改了上面的内容：
It does the job pretty well. Now, I want to make this a generic script and would like to take the input from the user which port he wants to connect. So, I thought taking input as a commandline argument is the best way to do. And I modified the above in the following way:
#!/usr/bin/env kermit
port_num="/dev/ttyUSB"+$1
set port port_num
set speed 115200
set carrier-watch off
set flow-control none
set prefixing all
set input echo on
上设置输入回显，但是，我得到以下错误：
But, I get the following error:
user4@user-pc-4:~/Scripts$ ./test.script 8
?Not a command or macro name: "port_num="/dev/ttyUSB$1""
File: /home/Scripts/test.script, Line: 2
port_num
?SET SPEED has no effect without prior SET LINE
"8" - invalid command-line option, type "kermit -h" for help
我尝试替换
port_num="/dev/ttyUSB"+$1
与
port_num="/dev/ttyUSB$1"
。
第二个脚本中有一个明显的缺陷。如何获取脚本以接受用户输入并使用 kermit 连接到串行端口？
There is an obvious flaw in my second script. How can I get the script to accept the user input and connect to the serial port using kermit?
推荐答案
kermit脚本语言与bash完全不同。命令行中传递的参数以bash中的美元符号扩展（如 $ 1 ）。在kermit中，它们使用反斜杠百分比表示法进行扩展，例如 \％1
The kermit script language is completely different from bash. Arguments passed on the command line are expanded by dollar signs in bash (as in $1). In kermit, they are expanded with the backslash-percent notation, as in \%1
脚本引擎的命令行参数，您必须使用 + 参数调用 kermit 。
To pass subsequent command line arguments to the scripting engine, you must invoke kermit with a + argument.
要告诉操作系统您的脚本必须由 kermit 解释，您使用了所谓的 env shebang ＃！/ usr / bin / env ，它与 + 参数不兼容。这意味着您必须在系统上找到 kermit ，发出命令
To tell the operating system that your script has to be interpreted by kermit, you used the so-called env shebang #!/usr/bin/env, which is incompatible with the + argument. This means that you have to locate kermit on your system, issuing the command
$ type kermit
kermit is /usr/bin/kermit
（另一个常见位置是 / usr / local / bin / kermit ）。现在，将正确的位置放置在shebang中，添加 + 参数，即可完成操作：
(another common location is /usr/local/bin/kermit). Now, place the correct location in the shebang, add the + argument, and you are done:
#!/usr/bin/kermit +
set port /dev/ttyUSB8\%1
set speed 115200
set carrier-watch off
set flow-control none
set prefixing all
set input echo on
如果您想定义一个宏（用户定义变量的别名），这是一种定义默认值的方法：
If you want to define a macro (kermit name for user-defined variables) you can, and this is a way to define default values:
assign port_num \%1
if not defined port_num assign port_num 8
set port /dev/ttyUSB\m(port_num)
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