Commands for what?
If you mean unren.bat it opens in a dos window and has the options listed there.
If you mean the commands for the dev console, press shift+D in game and that will bring up the console and you can select any of the options there.
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If you mean the commands for the cheats, that depends on the game. You need to look at the Variable Viewer
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Always best to have a save game before you do this... then you can roll back your changes if need be.
Choose the variable(s) you want to change. Maybe open a notepad file or screenshot the variables.
Click Return.
Open the console (shift+O)
Type {the variable name paying careful attention to upper and lower case} = {value}
Example: LanEng = False
press return
You can change multiple variables in one session
For a name it must be written {u"<name>"}
Example: aup = u"Great Grand Mother"
Note:
If the variable is in <> like aaa in the attached file. That is a variable set by the game and is best left alone.
If you misspell the variable such as Aup then you will get a new line in your variable list, hopefully it won't break your game.
Some games rely on the variables being accurate changing something may mean you miss an event. On the flip side, sometimes (on occasion) you can play multiple paths at the same time.
Some games have built in checks to stop you cheating. Like money being too high for example.
Hope this helps. If not, and you can't find the answer with a forum search, it would be best to open a new thread as this one has been listed as solved.