source: vendor/3.6.25/docs-xml/smbdotconf/misc/magicscript.xml

<samba:parameter name="magic script"
                 context="S"
                 type="string"
                 xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
        <para>This parameter specifies the name of a file which, 
        if opened, will be executed by the server when the file is closed. 
        This allows a UNIX script to be sent to the Samba host and 
        executed on behalf of the connected user.</para>

        <para>Scripts executed in this way will be deleted upon 
        completion assuming that the user has the appropriate level 
        of privilege and the file permissions allow the deletion.</para>

        <para>If the script generates output, output will be sent to 
        the file specified by the <smbconfoption name="magic output"/>
        parameter (see above).</para>

        <para>Note that some shells are unable to interpret scripts 
        containing CR/LF instead of CR as 
        the end-of-line marker. Magic scripts must be executable 
        <emphasis>as is</emphasis> on the host, which for some hosts and 
        some shells will require filtering at the DOS end.</para>

        <para>Magic scripts are <emphasis>EXPERIMENTAL</emphasis> and 
                should <emphasis>NOT</emphasis> be relied upon.</para>
</description>
<value type="default"></value>
<value type="example">user.csh</value>
</samba:parameter>