$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). $SYSTEMD_LESSCHARSET Override the charset passed to less (by default utf-8, if the invoking terminal is determined to be UTF-8 compatible).