快速查看manjaro的pacman 软件记录

软件安装分为：(installed|reinstalled|removed|downgraded|upgraded)

1、查看安装的 cat /var/log/pacman.log | grep -E installed 
2、查看再安装 cat /var/log/pacman.log | grep -E reinstalled
3、查看删除的 cat /var/log/pacman.log | grep -E removed
4、查看下载的 cat /var/log/pacman.log | grep -E downgraded
5、查看升级的 cat /var/log/pacman.log | grep -E upgraded

最好使用管道处理下：cat /var/log/pacman.log  | grep -E installed >>  ~/installed.txt
查看文件：vim ~/installed.txt