1.查找软件安装目录
whereis mysql
mysql: /usr/bin/mysql /usr/lib/mysql /etc/mysql /usr/share/mysql /usr/share/man/man1/mysql.1.gz
2.查找软件运行目录
which mysql
/usr/bin/mysql
3.查找文件
#当前目录下寻找dump开头的文件
sudo find -name dump*
./dump.rdb
#指定目录下，寻找以.gz结尾的文件
find /home -name *.gz
/home/software/jdk-8u144-linux-x64.tar.gz
/home/software/apache-tomcat-7.0.81.tar.gz
/home/software/nginx-1.12.1.tar.gz