systemd/man/standard-options.xml

<?xml version="1.0"?>
<!DOCTYPE variablelist PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->

<variablelist>
  <varlistentry id='help'>
    <term><option>-h</option></term>
    <term><option>--help</option></term>

    <listitem id='help-text'>
      <para id='help-para'>Print a short help text and exit.
    </para></listitem>
  </varlistentry>

  <varlistentry id='version'>
    <term><option>--version</option></term>

    <listitem id='version-text'>
      <para>Print a short version string and exit.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='no-pager'>
    <term><option>--no-pager</option></term>

    <listitem>
      <para>Do not pipe output into a pager.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='no-ask-password'>
    <term><option>--no-ask-password</option></term>

    <listitem><para>Do not query the user for authentication for privileged operations.</para></listitem>
  </varlistentry>

  <varlistentry id='legend'>
    <term><option>--legend=<replaceable>BOOL</replaceable></option></term>

    <listitem>
      <para>Enable or disable printing of the legend, i.e. column headers and the footer with hints. The
      legend is printed by default, unless disabled with <option>--quiet</option> or similar.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='no-legend'>
    <term><option>--no-legend</option></term>

    <listitem>
      <para>Do not print the legend, i.e. column headers and the
      footer with hints.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='cat-config'>
    <term><option>--cat-config</option></term>

    <listitem>
      <para>Copy the contents of config files to standard output.
      Before each file, the filename is printed as a comment.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='tldr'>
    <term><option>--tldr</option></term>

    <listitem>
      <para>Copy the contents of config files to standard output. Only the "interesting" parts of the
      configuration files are printed, comments and empty lines are skipped. Before each file, the filename
      is printed as a comment.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='json'>
    <term><option>--json=<replaceable>MODE</replaceable></option></term>

    <listitem><para>Shows output formatted as JSON. Expects one of <literal>short</literal> (for the
    shortest possible output without any redundant whitespace or line breaks), <literal>pretty</literal>
    (for a pretty version of the same, with indentation and line breaks) or <literal>off</literal> (to turn
    off JSON output, the default).</para></listitem>
  </varlistentry>

  <varlistentry id='j'>
    <term><option>-j</option></term>

    <listitem><para>Equivalent to <option>--json=pretty</option> if running on a terminal, and
    <option>--json=short</option> otherwise.</para></listitem>
  </varlistentry>

  <varlistentry id='signal'>
    <term><option>-s</option></term>
    <term><option>--signal=</option></term>

    <listitem>
      <para>When used with <command>kill</command>, choose which signal to send to selected processes. Must
      be one of the well-known signal specifiers such as <constant>SIGTERM</constant>,
      <constant>SIGINT</constant> or <constant>SIGSTOP</constant>. If omitted, defaults to
      <option>SIGTERM</option>.</para>

      <para>The special value <literal>help</literal> will list the known values and the program will exit
      immediately, and the special value <literal>list</literal> will list known values along with the
      numerical signal numbers and the program will exit immediately.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='image-policy-open'>
    <term><option>--image-policy=<replaceable>policy</replaceable></option></term>

    <listitem><para>Takes an image policy string as argument, as per
    <citerefentry><refentrytitle>systemd.image-policy</refentrytitle><manvolnum>7</manvolnum></citerefentry>. The
    policy is enforced when operating on the disk image specified via <option>--image=</option>, see
    above. If not specified defaults to the <literal>*</literal> policy, i.e. all recognized file systems
    in the image are used.</para></listitem>
  </varlistentry>

  <varlistentry id='esp-path'>
    <term><option>--esp-path=</option></term>

    <listitem>
      <para>Path to the EFI System Partition (ESP). If not specified, <filename>/efi/</filename>,
      <filename>/boot/</filename>, and <filename>/boot/efi/</filename> are checked in turn. It is
      recommended to mount the ESP to <filename>/efi/</filename>, if possible.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='boot-path'>
    <term><option>--boot-path=</option></term>

    <listitem>
      <para>Path to the Extended Boot Loader partition, as defined in the
      <ulink url="https://uapi-group.org/specifications/specs/boot_loader_specification">Boot Loader Specification</ulink>.
      If not specified, <filename>/boot/</filename> is checked. It is recommended to mount the Extended Boot
      Loader partition to <filename>/boot/</filename>, if possible.</para>
    </listitem>
  </varlistentry>

  <varlistentry id='option-P'>
    <term><option>-P</option></term>

    <listitem>
      <para>Equivalent to <option>--value</option> <option>--property=</option>, i.e. shows the value of the
      property without the property name or <literal>=</literal>. Note that using <option>-P</option> once
      will also affect all properties listed with <option>-p</option>/<option>--property=</option>.</para>
    </listitem>
  </varlistentry>
</variablelist>