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><H1
><A
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>exec</A
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>exec -- Execute an external program</DIV
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><H2
>Description</H2
><DIV
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><P
></P
><CODE
CLASS="FUNCDEF"
>string exec</CODE
>(string command, string 
      [<SPAN
CLASS="optional"
>array</SPAN
>]
      
     , int 
      [<SPAN
CLASS="optional"
>return_var</SPAN
>]
     );<P
></P
></DIV
><P
>&#13;     <B
CLASS="function"
>exec()</B
> executes the given
     <TT
CLASS="parameter"
><I
>command</I
></TT
>, however it does not output
     anything.  It simply returns the last line from the result of the
     command.  If you need to execute a command and have all the data
     from the command passed directly back without any interference,
     use the <B
CLASS="function"
>PassThru()</B
> function.
    </P
><P
>&#13;     If the <TT
CLASS="parameter"
><I
>array</I
></TT
> argument is present, then the
     specified array will be filled with every line of output from the
     command.  Note that if the array already contains some elements,
     <B
CLASS="function"
>exec()</B
> will append to the end of the array.
     If you do not want the function to append elements, call
     <A
HREF="function.unset.html"
><B
CLASS="function"
>unset()</B
></A
> on the array before passing it to
     <B
CLASS="function"
>exec()</B
>.
    </P
><P
>&#13;     If the <TT
CLASS="parameter"
><I
>return_var</I
></TT
> argument is present
     along with the <TT
CLASS="parameter"
><I
>array</I
></TT
> argument, then the
     return status of the executed command will be written to this
     variable.
    </P
><P
>&#13;     Note that if you are going to allow data coming from user input
     to be passed to this function, then you should be using
     <B
CLASS="function"
>EscapeShellCmd()</B
> to make sure that users
     cannot trick the system into executing arbitrary commands.
    </P
><P
>&#13;     See also <A
HREF="function.system.html"
><B
CLASS="function"
>system()</B
></A
>,
     <B
CLASS="function"
>PassThru()</B
>, <A
HREF="function.popen.html"
><B
CLASS="function"
>popen()</B
></A
>,
     <B
CLASS="function"
>EscapeShellCmd()</B
>, and the <A
HREF="language.operators.execution.html"
>backtick operator</A
>.
    </P
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