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man: move quoting description to systemd.syntax
We use very similar quoting rules in many places. Let's move this lengthy text out of systemd.service page.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
parent
36f57e02d7
commit
4d729e3796
@ -1107,11 +1107,9 @@
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</variablelist>
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<para>Check
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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and
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<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for more settings.</para>
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> and
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<citerefentry><refentrytitle>systemd.kill</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more
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settings.</para>
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</refsect1>
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<refsect1>
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@ -1126,21 +1124,13 @@
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<varname>ExecStop=</varname>, and
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<varname>ExecStopPost=</varname> options.</para>
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<para>Multiple command lines may be concatenated in a single
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directive by separating them with semicolons (these semicolons
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must be passed as separate words). Lone semicolons may be escaped
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as <literal>\;</literal>.</para>
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<para>Multiple command lines may be concatenated in a single directive by separating them with semicolons
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(these semicolons must be passed as separate words). Lone semicolons may be escaped as
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<literal>\;</literal>.</para>
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<para>Each command line is split on whitespace, with the first item being the command to
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execute, and the subsequent items being the arguments. Double quotes ("…") and single quotes
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('…') may be used to wrap a whole item (the opening quote may appear only at the beginning or
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after whitespace that is not quoted, and the closing quote must be followed by whitespace or the
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end of line), in which case everything until the next matching quote becomes part of the same
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argument. Quotes themselves are removed. C-style escapes are also supported. The table below
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contains the list of known escape patterns. Only escape patterns which match the syntax in the
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table are allowed; other patterns may be added in the future and unknown patterns will result in
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a warning. In particular, any backslashes should be doubled. Finally, a trailing backslash
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(<literal>\</literal>) may be used to merge lines.</para>
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<para>Each command line is unquoted using the rules described in "Quoting" section in
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<citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry>. The
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first item becomes the command to execute, and the subsequent items the arguments.</para>
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<para>This syntax is inspired by shell syntax, but only the meta-characters and expansions
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described in the following paragraphs are understood, and the expansion of variables is
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@ -1240,74 +1230,6 @@ ls</programlisting>
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<literal>>/dev/null</literal>,
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<literal>&</literal>, <literal>;</literal>, and
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<literal>ls</literal>.</para>
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<table>
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<title>C escapes supported in command lines and environment variables</title>
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<tgroup cols='2'>
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<colspec colname='escape' />
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<colspec colname='meaning' />
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<thead>
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<row>
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<entry>Literal</entry>
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<entry>Actual value</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><literal>\a</literal></entry>
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<entry>bell</entry>
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</row>
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<row>
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<entry><literal>\b</literal></entry>
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<entry>backspace</entry>
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</row>
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<row>
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<entry><literal>\f</literal></entry>
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<entry>form feed</entry>
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</row>
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<row>
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<entry><literal>\n</literal></entry>
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<entry>newline</entry>
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</row>
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<row>
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<entry><literal>\r</literal></entry>
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<entry>carriage return</entry>
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</row>
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<row>
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<entry><literal>\t</literal></entry>
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<entry>tab</entry>
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</row>
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<row>
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<entry><literal>\v</literal></entry>
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<entry>vertical tab</entry>
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</row>
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<row>
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<entry><literal>\\</literal></entry>
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<entry>backslash</entry>
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</row>
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<row>
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<entry><literal>\"</literal></entry>
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<entry>double quotation mark</entry>
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</row>
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<row>
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<entry><literal>\'</literal></entry>
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<entry>single quotation mark</entry>
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</row>
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<row>
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<entry><literal>\s</literal></entry>
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<entry>space</entry>
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</row>
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<row>
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<entry><literal>\x<replaceable>xx</replaceable></literal></entry>
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<entry>character number <replaceable>xx</replaceable> in hexadecimal encoding</entry>
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</row>
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<row>
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<entry><literal>\<replaceable>nnn</replaceable></literal></entry>
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<entry>character number <replaceable>nnn</replaceable> in octal encoding</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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<refsect1>
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@ -74,10 +74,10 @@
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<filename>.ini</filename> files.
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</para>
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<para>Each file is a plain text file divided into sections, with configuration entries in the
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style <replaceable>key</replaceable>=<replaceable>value</replaceable>.
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Whitespace immediately before or after the <literal>=</literal> is ignored. Empty lines and lines starting with <literal>#</literal> or <literal>;</literal> are
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ignored, which may be used for commenting.</para>
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<para>Each file is a plain text file divided into sections, with configuration entries in the style
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<replaceable>key</replaceable>=<replaceable>value</replaceable>. Whitespace immediately before or after
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the <literal>=</literal> is ignored. Empty lines and lines starting with <literal>#</literal> or
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<literal>;</literal> are ignored, which may be used for commenting.</para>
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<para>Lines ending in a backslash are concatenated with the following line while reading and the
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backslash is replaced by a space character. This may be used to wrap long lines. The limit on
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@ -129,6 +129,88 @@ KeyThree=value 3\
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file format.</para>
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</refsect1>
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<refsect1>
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<title>Quoting</title>
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<para>For settings where quoting is allowed, the following general rules apply: double quotes ("…") and
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single quotes ('…') may be used to wrap a whole item (the opening quote may appear only at the beginning
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or after whitespace that is not quoted, and the closing quote must be followed by whitespace or the end
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of line), in which case everything until the next matching quote becomes part of the same item. Quotes
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themselves are removed. C-style escapes are also supported. The table below contains the list of known
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escape patterns. Only escape patterns which match the syntax in the table are allowed; other patterns may
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be added in the future and unknown patterns will result in a warning. In particular, any backslashes
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should be doubled. Finally, a trailing backslash (<literal>\</literal>) may be used to merge lines, as
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described above.</para>
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<table>
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<title>Supported C escapes</title>
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<tgroup cols='2'>
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<colspec colname='escape' />
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<colspec colname='meaning' />
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<thead>
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<row>
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<entry>Literal</entry>
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<entry>Actual value</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><literal>\a</literal></entry>
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<entry>bell</entry>
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</row>
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<row>
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<entry><literal>\b</literal></entry>
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<entry>backspace</entry>
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</row>
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<row>
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<entry><literal>\f</literal></entry>
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<entry>form feed</entry>
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</row>
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<row>
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<entry><literal>\n</literal></entry>
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<entry>newline</entry>
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</row>
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<row>
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<entry><literal>\r</literal></entry>
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<entry>carriage return</entry>
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</row>
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<row>
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<entry><literal>\t</literal></entry>
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<entry>tab</entry>
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</row>
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<row>
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<entry><literal>\v</literal></entry>
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<entry>vertical tab</entry>
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</row>
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<row>
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<entry><literal>\\</literal></entry>
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<entry>backslash</entry>
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</row>
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<row>
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<entry><literal>\"</literal></entry>
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<entry>double quotation mark</entry>
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</row>
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<row>
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<entry><literal>\'</literal></entry>
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<entry>single quotation mark</entry>
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</row>
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<row>
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<entry><literal>\s</literal></entry>
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<entry>space</entry>
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</row>
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<row>
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<entry><literal>\x<replaceable>xx</replaceable></literal></entry>
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<entry>character number <replaceable>xx</replaceable> in hexadecimal encoding</entry>
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</row>
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<row>
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<entry><literal>\<replaceable>nnn</replaceable></literal></entry>
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<entry>character number <replaceable>nnn</replaceable> in octal encoding</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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