using “sudoedit” on Linux

• https://stackoverflow.com/questions/22084422/what-is-the-difference-between-sudoedit-and-sudo-vim#22084506
• http://www.wingtiplabs.com/blog/posts/2013/03/13/sudoedit/

This protects /etc/crontab against concurrent editing and corruption:
$ sudoedit /etc/crontab