[Linux & cli] Useful Linux command

Details

The following are some useful commands which usually made use and always being forgotten when needed, here is a note down.

• Edit /etc/fstab to mount new drives (files system, mount point, type, options, dump, pass)
• /dev/sdb1   /home/jacky/Documents/2tb-hdd   ext4   defaults  0   0
• mount -av (run from root, show the mount point)
• Run command and pipe all output to file
• do_something 2>&1 | tee -a some_file (2>&1 is to direct all stderr to stdout)
• Clear all text in a text file
• > someTxtFile.txt
• Kill process occupied by a known port (e.g. 32769)
• sudo kill -9 $(sudo lsof -t -i:32769)

References

• Reload fstab
  
• Linux Tutorial - 11. Piping and Redirection
  
• direct-stderr-and-stdout-in-bash
  
• Understanding crontab