Linux Useful Commands

ls -al 列出全部目录及rwx权限
ls -l filename 列出文件rwx权限
du -h . disk use helper - 列出各个文件大小
ls -ltr list all files by modification time, sorting(t) reverse(r)
less filename
/ – search for a pattern which will take you to the next occurrence.
CTRL+F – forward one window
CTRL+B – backward one window

Reference:

• 了解Linux读写权限
• Kill process listening on a port