输入命令
rpm -qa
系统报错：
rpmdb: Program version 4.3 doesn’t match environment version
error: db4 error(-30974) from dbenv->open: DB_VERSION_MISMATCH: Database environment version mismatch
error: cannot open Packages index using db3 – (-30974)
error: cannot open Packages database in /var/lib/rpm
解决方法：
cd /var/lib/rpm
rm -rf __
rpm –rebuilddb相关日志*shell grep 查找进程的小技巧
PHP Warning: PHP Startup: pdo_mysql: Unable to initialize module
Linux ar 命令
Git 远程仓库的使用
mount disk Image
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