Column guide in Emacs

Many professional editors have a column guide. For example, below you see in the Powershell editor a veritcal line at column 80.

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This marker comes in handy, if you want to print your files. In Emacs I usually check for the column 80 in the status line.

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However, I usually forget to check, and when I print out stuff or publish, I got line breaks where I don’t want them. Passing the 80th column for comments is not a problem, as a simple Ctrl-q forces Emacs to break the lines nicely and add comment symbols at the beginning.

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