com.apple.finder AppleShowAllFiles false; killall Finder DON'T WORK MORE :(

Hi, i did the command com.apple.finder AppleShowAllFiles true; killall Finder, for showing hidden files, then exit from terminal, but when i run again terminal and write " com.apple.finder AppleShowAllFiles false; killall Finder " this don't work and show this message " -bash: com.apple.finder: command not found "

I try to did this command because i have some problem with my iMac: when it go to sleep mode it won't wake up; i see only black screen and i need to force reset pressing the power button. So, any time, befoure live i need to shut down my iMac if i do not use it. I hope I have been able to explain the problem

So, now i even see hidden files :((

Can somebody help me?

Thank you on advice