bash 如何在linux bash脚本中用“-”字符（破折号）声明变量名
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how to declare variable name with "-" char (dash ) in linux bash script
提问by Jayesh Bhoi
I wrote simple script as follow
我写了简单的脚本如下
#!/bin/bash
auth_type=""
SM_Read-only="Yes"
SM_write-only="No"
echo -e ${SM_Read-only}
echo -e ${SM_Write-only}
if [ "${SM_Read-only}" == "Yes" ] && [ "${SM_Write-only}" == "Yes" ]
then
auth_type="Read Write"
else
auth_type="Read"
fi
echo -e $auth_type
And when i execute it i got following output with errors.
当我执行它时，我得到以下输出错误。
./script.bash: line 5: SM_Read-only=Yes: command not found
./script.bash: line 6: SM_write-only=No: command not found
only
only
Read
Any one know correct way to declare the variable with "-" (dash)?
有人知道用“-”（破折号）声明变量的正确方法吗？
EDIT:
编辑：
have getting response from c code and evaluate the variables for example
例如从 c 代码得到响应并评估变量
RESP=`getValue SM_ Read-only ,Write-only 2>${ERR_DEV}`
RC=$?
eval "$RESP"
from above scripts code my c binary getValueknow that script want Read-onlyand Write-onlyand return value to script.So during eval $RESPin cause error and in my script i access variable by
从上面的脚本代码我的 c 二进制文件getValue知道脚本想要Read-only并Write-only返回值到脚本。所以eval $RESP在导致错误和我的脚本中我访问变量
echo -e ${SM_Read-only}
echo -e ${SM_Write-only}
which also cause error.
这也会导致错误。
回答by Малъ Скрылевъ
Rename the variable name as follows:
重命名变量名称如下：
SM_Read_only="Yes"
SM_write_only="No"
Please, don't use -minus sign in variable names in bash, please refer to the answer, on how to set the proper variable name in bash.
请不要-在bash中的变量名中使用减号，请参阅答案，了解如何在bash 中设置正确的变量名。
However if you generate the code, based on others output, you can simply process their output with sed:
但是，如果您根据其他人的输出生成代码，您可以简单地使用sed处理他们的输出：
RESP=$(getValue SM_ Read-rule,Write-rule 2>${ERR_DEV}|sed "s/-/_/")
RC=$?
eval "$RESP"
回答by Barmar
-is not allowed in shell variable names. Only letters, numbers, and underscore, and the first character must be a letter or underscore.
-不允许在 shell 变量名中出现。只有字母、数字和下划线，并且第一个字符必须是字母或下划线。
回答by Coconop
I think you cant have a dash in your variables names, only letters, digits and "_" Try:
我认为你的变量名不能有破折号，只有字母、数字和“_”试试：
SM_Read_only
SM_只读
Or
或者
SM_ReadOnly
SM_只读
