I use the less command a lot to view files, but when viewing a file, sometimes accidentally I type the s key within less, activating then the log feature. If I don't notice that log in the bottom of the terminal and keep typing (such as searching for a pattern), a file may be created in the current directory.

According to man less, there is a "secure" mode for less, when the environment variable LESSSECURE is set to 1, but this will disable several more features, I only want to disable the log feature.

I never use the log feature in less. How can I disable the log feature of less?

1 Answer 1


Create a file setting a new key binding for the s command key, and "compile it" as follows:

echo 's invalid' >~/.lesskey

Then typing s in less will just beep or flash.

  • Yes it works as expected, but I created an alias in my .bashrc, so my less is actually less -RM -s +Gg, so I'm wondering if the making-s-invalid can be set into the alias, since I have to type commands and compile the file into another file ~/.less if using your solution.
    – CodyChan
    Jun 30, 2015 at 9:11
  • I dont think you can make it an option to the less command. But you only need to run lesskey once. Why not add it in your ~/.bash_profile if you dont want to forget it. You can specify a different place for the .less file.
    – meuh
    Jun 30, 2015 at 9:31

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