$SYSTEMD_PAGER Pager to use when --no-pager is not given; overrides $PAGER. If neither $SYSTEMD_PAGER nor $PAGER are set, a set of well-known pager implementations are tried in turn, including less1 and more1, until one is found. If no pager implementation is discovered no pager is invoked. Setting this environment variable to an empty string or the value cat is equivalent to passing --no-pager. $SYSTEMD_LESS Override the options passed to less (by default FRSXMK). If the value of $SYSTEMD_LESS does not include K, and the pager that is invoked is less, CtrlC will be ignored by the executable. This allows less to handle CtrlC itself. $SYSTEMD_LESSCHARSET Override the charset passed to less (by default utf-8, if the invoking terminal is determined to be UTF-8 compatible).