bash 无法使用 mkdir 创建目录
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Unable to create a directory using mkdir
提问by user2122377
I installed Openfoam a couple of days ago . I could follow the instructions given herewithout facing any major issues. However, when I run the command $mkdir -p $FOAM_RUNtoday, I am getting this error: mkdir: missing operand. I also tried mkdir -p "$FOAM_RUN"(it is suggested here). Even this failed with the error message mkdir: cannot create directory `': No such file or directory. /.bashrc file is updated as per the instructions given on Openfoam website.
我几天前安装了 Openfoam。我可以按照此处给出的说明进行操作，而不会遇到任何重大问题。但是，当我$mkdir -p $FOAM_RUN今天运行命令时，出现以下错误：mkdir: missing operand. 我也试过mkdir -p "$FOAM_RUN"（这里建议）。即使这失败并显示错误消息mkdir: cannot create directory `': No such file or directory。/.bashrc 文件根据 Openfoam 网站上的说明进行更新。
回答by unxnut
Seems to me that your variable $FOAM_RUNis not defined. You can confirm that by executing the command: echo $FOAM_RUN
在我看来，您的变量$FOAM_RUN未定义。您可以通过执行以下命令来确认：echo $FOAM_RUN
回答by Classified
Like @unxnut said, your variable is not defined. To define the variable, you just type:
就像@unxnut 说的，你的变量没有定义。要定义变量，您只需键入：
FOAM_RUN=dir_name
then your above command will create a directory called "dir_name", or whatever you assign FOAM_RUN.
那么你上面的命令将创建一个名为“dir_name”的目录，或者你分配的任何 FOAM_RUN 目录。
Hope this helps.
希望这可以帮助。
