Executing shell commands from SLAX scripts

Starting with 14.1, it’s possible to execute shell commands from SLAX scripts.

This is an example of how you can get the output of the shell command “ifconfig me0”.

First configure the OP script like this:

{master:0}[edit]
lab@ex4550# show system scripts 
op {
    file script.slax;
}

{master:0}[edit]
lab@ex4550#

And then execute it:

{ex4550:0}
lab@icosium> show version | match Junos: 
Junos: 14.1X53-D10.1

{ex4550:0}
lab@icosium> op ?
Possible completions:
  invoke-debugger      Invoke script in debugger mode
  script               
  url                  Execution of remote op script
{master:0}
lab@ex4550> op script    
me0:    encaps: ether; framing: ether
        flags=0x3/0x8000 <PRESENT|RUNNING>
        curr media: i802 54:e0:32:86:f8:fd
me0.0:  flags=0x8000 <UP|MULTICAST>
        inet primary mtu 1500 local=172.30.158.163 dest=172.30.158.0/23 bcast=172.30.159.255

{master:0}
lab@ex4550>

This is the script:

version 1.0;
ns junos = "http://xml.juniper.net/junos/*/junos";
ns xnm = "http://xml.juniper.net/xnm/1.1/xnm";
ns jcs = "http://xml.juniper.net/junos/commit-scripts/1.0";
import "../import/junos.xsl";

var $local = jcs:open();
match / {
    <op-script-results> {
        var $rpc = {
            <request-shell-execute> {
                <command> "ifconfig me0";
            }
        }
        var $result = jcs:execute($local,$rpc);
        copy-of $result;
        expr jcs:close($local);
    }
}

Of course this is just a simple example with no real value.

In my current role, I had a lot of occasions where this could have been handy and I hope others will find this useful.

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Paris ARAU

Paris ARAU is a networking professional with strong background on routing and switching technologies. He is a holder of CCIE R&S and dual JNCIE(SP and ENT). The day to day work allows him to dive deeply in networking technologies. Part of the continuously training, he is focusing on Software Defined Network and cloud computing.

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