apt-cache pkgnames：列出当前所有可用的软件包
czy@Mint ~ $ apt-cache pkgnames libdatrie-doc libfstrcmp0-dbg librime-data-sampheng python-pyao-dbg fonts-georgewilliams python3-aptdaemon.test libcollada2gltfconvert-dev python3-doc8 r-bioc-hypergraph angrydd fonts-linuxlibertine pike8.0-pg libslurmdb-dev libvformat0 linux-image-extra-4.4.0-127-generic davical
apt-cache search <package-name>：查询指定名称的软件包，可以包含正则表达式
czy@Mint ~ $ apt-cache search ^openjdk openjdk-8-dbg - Java runtime based on OpenJDK (debugging symbols) openjdk-8-demo - Java runtime based on OpenJDK (demos and examples) openjdk-8-doc - OpenJDK Development Kit (JDK) documentation openjdk-8-jdk - OpenJDK Development Kit (JDK) openjdk-8-jdk-headless - OpenJDK Development Kit (JDK) (headless) openjdk-8-jre - OpenJDK Java runtime, using Hotspot JIT openjdk-8-jre