To set alias for a very long command in cmd, just type

alias name=command


And you’re done.

However, one thing that would be nice to have is that if we have a command that is not so static meaning we want the ability to use, I don’t know the proper name, variables like %cd% to substitute for the current directory location of the caller.

It’s important to insert %cd% in a plain string into the alias, and not to be resolved to get the current directory location for that time, which renders the command static again.

Say, if I want to add this command, echo %cd% to the alias. I would rather get echo \my\current\location\at\the\time\i\invoke\alias\instead It’s not so good right ?

Now, I try to find a way to escape the % (percent-sign) from the command line, which some say to be ^. With ^ you can echo ^%cd^% and you get echo %cd% in your standard output, which should be about right ….

Try using this trick with alias .. I found that it doesn’t work. To me, it’s like alias has gone another step ahead of me. No matter how I try to escape the % sign, alias always know how to de-escape it and evaluate the expression I always wanted to hide.

#### Solution: Write a proxy program (runner)

I reasoned with myself if I still want to use alias to do the job. I have to use the strings it doesn’t recognize … may be ${cd} insead of %cd% and ${home} instead of %home%.

Start with a string replacing progrem … I’ll try to use only batch script. Since, I can access to the arguments via %* in batch script and replacing with the syntax !str:pattern=replacement!. I can now replace all the arguments with the correct one

setlocal ENABLEDELAYEDEXPANSION
set str=%*
set str=!str:${cd}=%CD%! set str=!str:${home}=%HOME%!


Note: With no particular knowledge about ENABLEDELAYEDEXPANSION, I was suggested to put it there.

Now, I can suspect the variable str to be the replaced arguments ready to be supplied to the program. The only missing part is only the execution part, which is as easy as %str%

Here is the full code:

@echo off

REM run command by parsing ${cd} to %cd% and${home} to %home%
setlocal ENABLEDELAYEDEXPANSION
set str=%*
set str=!str:${cd}=%CD%! set str=!str:${home}=%HOME%!

REM run the parsed command
%str%


Let’s name it run.cmd and save it into some directory within the PATH environment variable.

If I were to execute a command I would rather use the run.cmd as a proxy instead:

run.cmd echo ${cd}  It equals to : echo %cd%  But, the whole thing is for this moment when we can do this to alias: alias whereami=run echo${cd}


And you can practically use:

whereami


And gets your current directory location everytime not the one at the time when you added it.