“命令未找到”，但“包已经是最新版本”

Question

所以我想运行一个代码，并且我找不到错误命令，但是当我尝试安装它时，它说它已完全安装，我很困惑。 我正在运行Debian 7 Wheezy

bash: libavcodec-dev: command not found
root@vps304348:~# sudo libavcodec-dev libavutil-dev libswscale-dev libasound2-dev libpulse-dev libjack-jackd2-dev
sudo: libavcodec-dev: command not found
root@vps304348:~# apt-get install libavcodec-dev                                Reading package lists... Done
Building dependency tree
Reading state information... Done
libavcodec-dev is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
root@vps304348:~#

屏幕截图：http://imgur.com/a/tHNcj

Answer 1

libavcodec-dev 不是二进制文件，它是库的开发文件。