$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). Users might want to change two options in particular: K This option instructs the pager to exit immediately when CtrlC is pressed. To allow less to handle CtrlC itself to switch back to the pager command prompt, unset this option. 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, and needs to be handled by the pager. X This option instructs the pager to not send termcap initialization and deinitialization strings to the terminal. It is set by default to allow command output to remain visible in the terminal even after the pager exits. Nevertheless, this prevents some pager functionality from working, in particular paged output cannot be scrolled with the mouse. See less1 for more discussion. $SYSTEMD_LESSCHARSET Override the charset passed to less (by default utf-8, if the invoking terminal is determined to be UTF-8 compatible). $SYSTEMD_COLORS The value must be a boolean. Controls whether colorized output should be generated. This can be specified to override the decision that systemd makes based on $TERM and what the console is connected to. $SYSTEMD_URLIFY The value must be a boolean. Controls whether clickable links should be generated in the output for terminal emulators supporting this. This can be specified to override the decision that systemd makes based on $TERM and other conditions.