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Diffstat (limited to 'man/systemd.service.xml')
| -rw-r--r-- | man/systemd.service.xml | 50 |
1 files changed, 33 insertions, 17 deletions
diff --git a/man/systemd.service.xml b/man/systemd.service.xml index dbc82edbd4..50ff2f5bd5 100644 --- a/man/systemd.service.xml +++ b/man/systemd.service.xml @@ -1215,13 +1215,39 @@ contains, resulting in a single argument. Use <literal>$FOO</literal> as a separate word on the command line, in which case it will be replaced by the - value of the environment variable split at whitespace, - resulting in zero or more arguments. To pass a literal - dollar sign, use <literal>$$</literal>. Variables - whose value is not known at expansion time are treated - as empty strings. Note that the first argument - (i.e. the program to execute) may not be a - variable.</para> + value of the environment variable split at whitespace + resulting in zero or more arguments. For this type of + expansion, quotes and respected when splitting into + words, and afterwards removed.</para> + + <para>Example:</para> + + <programlisting>Environment="ONE=one" 'TWO=two two' +ExecStart=/bin/echo $ONE $TWO ${TWO}</programlisting> + + <para>This will execute <command>/bin/echo</command> + with four arguments: <literal>one</literal>, + <literal>two</literal>, <literal>two</literal>, and + <literal>two two</literal>.</para> + + <para>Example:</para> + <programlisting>Environment=ONE='one' "TWO='two two' too" THREE= +ExecStart=/bin/echo ${ONE} ${TWO} ${THREE} +ExecStart=/bin/echo $ONE $TWO $THREE</programlisting> + <para>This results in <filename>echo</filename> being + called twice, the first time with arguments + <literal>'one'</literal>, + <literal>'two two' too</literal>, <literal></literal>, + and the second time with arguments + <literal>one</literal>, <literal>two two</literal>, + <literal>too</literal>. + </para> + + <para>To pass a literal dollar sign, use + <literal>$$</literal>. Variables whose value is not + known at expansion time are treated as empty + strings. Note that the first argument (i.e. the + program to execute) may not be a variable.</para> <para>Variables to be used in this fashion may be defined through <varname>Environment=</varname> and @@ -1259,16 +1285,6 @@ <literal>>/dev/null</literal>, <literal>&</literal>, <literal>;</literal>, and <literal>/bin/ls</literal>.</para> - - <para>Example:</para> - - <programlisting>Environment="ONE=one" 'TWO=two two' -ExecStart=/bin/echo $ONE $TWO ${TWO}</programlisting> - - <para>This will execute <command>/bin/echo</command> - with four arguments: <literal>one</literal>, - <literal>two</literal>, <literal>two</literal>, and - <literal>two two</literal>.</para> </refsect1> <refsect1> |