Running openssl commands in PowerShell
You don't need Invoke-Expression (in fact, it's not recommended except in specific cases because it is susceptible to injection). Just run the command and quote the parameters where you need variable string expansion:
openssl pkcs12 -in "$certCN.pfx" -nocerts -nodes -out "$certCN.key" -password pass:1111To ignore the output of the command, one common technique is to pipe to Out-Null.
And five minutes after I posted this I found THIS article:
Which shows to simply put
2>&1 at the end of the string to redirect successes and errors to null as such:
Invoke-Expression "openssl pkcs12 -in $certCN.pfx -nocerts -nodes -out $certCN.key -password pass:1111" 2>&1Works like champ for my needs.