How to write linux bash syntax in DOS?

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save as 'batch.CMD' and doubleClick to see instructions of set

Should I use SET /A alias?

In addition to Ed's excellent advice, see also viewtopic.php?p=14700#p14700 and other previous posts of your own. PATH is no different from CD or TAB.

Nobody understands my question? I don't ask how to set global variable PATH.

I ask how to evaluate/perform command and set its output to variable.

I simplified the original code before posting it here

Expanding of variables are done with percents.



You could also use exclamation marks if you use setlocal EnableDelayedExpansion before.

To escape a single percent you have to double it.



jeb

inname is not a command. Somebody told me to use alias command, but that's linux command.

You cannot directly set the output of a command to a variable in batch files like you can with BASH or other linux shells. Batch doesn't know that that back quote means to execute the command before assigning it to a variable.
You need to put the command inside a FOR /F loop and assign the output of the command to a variable from there.