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or a symlink to a regular file. Previously, symlinking to /dev/null would cause less to trash /dev/null if run with sufficient privileges, as seen in PR misc/42237. While the official way to disable .lesshst is to set an environment variable, that is problematic in some cases, such as single-user mode. A safer way to prevent even an unpatched less from writing anything out is to mkdir ~/.lesshst.