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32th chunk of `systemctl.man`
c0204f28ebe0e13212083d55f8a8b0ba8d947b4f3cc78f2d0000000100000c57
 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 less(1) 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_PAGERSECURE
           Takes a boolean argument. When true, the "secure" mode of the pager is enabled; if false, disabled. If $SYSTEMD_PAGERSECURE is not set at all, secure mode is enabled if the effective UID is not the same as the
           owner of the login session, see geteuid(2) and sd_pid_get_owner_uid(3). In secure mode, LESSSECURE=1 will be set when invoking the pager, and the pager shall disable commands that open or create new files or start
           new subprocesses. When $SYSTEMD_PAGERSECURE is not set at all, pagers which are not known to implement secure mode will not be used. (Currently only less(1) implements secure mode.)

           Note: when commands are invoked with elevated privileges, for example under sudo(8) or pkexec(1), care must be taken to ensure that unintended interactive features are not enabled. "Secure" mode for the pager may
           be enabled automatically as describe above. Setting SYSTEMD_PAGERSECURE=0 or not removing it from the inherited environment allows the user to invoke arbitrary commands. Note that if the $SYSTEMD_PAGER or $PAGER
           variables are to be honoured, $SYSTEMD_PAGERSECURE must be set too. It might be reasonable to completely disable the pager using --no-pager instead.

       $SYSTEMD_COLORS
           Takes a boolean argument. When true, systemd and related utilities will use colors in their output, otherwise the output will be monochrome. Additionally, the variable can take one of the following special values:
           "16", "256" to restrict the use of colors to the base 16 or 256 ANSI colors, respectively. This can be specified to override the automatic decision 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.

SEE ALSO
       systemd(1), journalctl(1), loginctl(1), machinectl(1), systemd.unit(5), systemd.resource‐control(5), systemd.special(7), wall(1), systemd.preset(5), systemd.generator(7), glob(7)

NOTES
        1. Discoverable Partitions Specification
           https://uapi‐group.org/specifications/specs/discoverable_partitions_specification

        2. LSB 3.0.0
           http://refspecs.linuxbase.org/LSB_3.0.0/LSB‐PDA/LSB‐PDA/iniscrptact.html

systemd 253                                                                                                                                                                                                         SYSTEMCTL(1)
Title: Systemd Environment Variables: Colors, URLification, Security Considerations, and See Also
Summary
This section further details systemd environment variables. It expands on `$SYSTEMD_LESSCHARSET` and `$SYSTEMD_PAGERSECURE`, explaining secure mode implementation and security considerations with elevated privileges using `sudo` or `pkexec`. It then describes `$SYSTEMD_COLORS` for controlling colored output (monochrome, 16, or 256 colors). Next, `$SYSTEMD_URLIFY` allows control over clickable links in terminal output. Finally, the section includes a 'SEE ALSO' list of related systemd utilities and specifications and some notes referencing specifications such as the Discoverable Partitions Specification and LSB 3.0.0.