citreu@asus-laptop:~$ guix describe Generation 114 9月 26 2022 13:24:04 (当前) guix 754ce58 repository URL: https://mirror.guix.org.cn/git/guix branch: master commit: 754ce586e013582b0f6d28337fdc46db35395997 citreu@asus-laptop:~$ guix shell ffmpeg@4 --pure -- ffplay guix shell: error: ffplay: command not found -- Retrieve my PGP public key: gpg --recv-keys B3EBC086AB0EBC0F45E0B4D433DB374BCEE4D9DC Zihao