In addition to immediately clearing the console history after you unlock, observe best-practices and don't even directly type in the unlock command, at least not the password part. Pull it from a password mgr, or if for some (bad) reason you don't use one, type it out in chunks in notepad, intermixed with garbage characters, then copy and paste chunk by chunk. If your computer has keylogging malware you could get seriously fucked otherwise.
Never use the keyboard directly to type sensitive passwords. When I have to type a password, I use the Windows 8.1 on-screen keyboard which keyloggers can't pick up.