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# How To Extend snmpd with custom script/data
Some SNMP servers can be extended with custom scripts or programs. The output of the running script can then
be read using the OID and can therefore be easily used in Cacti. An example is the thermometer on the USB port.
In combination with [Graph a Single SNMP OID](Graph-a-Single-SNMP-OID.md), this is a very simple way to display such data
We will show the procedure for the very extensive Net-SNMP and FreeBSD BSNMPD.
## Linux Net-SNMP
Simply add a line to /etc/snmpd.conf and restart snmpd
**> extend test /bin/echo hello**
Result will be here:
**> snmpwalk -v2c -c testing 127.0.0.1 nsExtendOutput1**
``
NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."test" = STRING: hello
NET-SNMP-EXTEND-MIB::nsExtendOutputFull."test" = STRING: hello
NET-SNMP-EXTEND-MIB::nsExtendOutNumLines."test" = INTEGER: 1
NET-SNMP-EXTEND-MIB::nsExtendResult."test" = INTEGER: 0``
For Cacti you need numeric OID, you can use snmptranslate:
**> snmptranslate -On NET-SNMP-EXTEND-MIB::nsExtendOutput1Line.\"test\"**
The result is an OID that we can use:
``.1.3.6.1.4.1.8072.1.3.2.3.1.1.4.116.101.115.116``
## FreeBSD BNSMPD
You need install bsnmp-ucd
**> pkg install bsnmp-ucd**
Add these lines to /etc/snmpd.config and restart bsnmpd
begemotSnmpdModulePath."ucd" = "/usr/local/lib/snmp_ucd.so"
%ucd
extNames.0 = "first command"
extCommand.0 = "/path/to/script.sh"
extNames.1 = "second command"
extCommand.1 = "/path/to/script.sh param1"
Name and result of first command have the same intex:
**> snmpwalk -v2c -c testing 127.0.0.1 .1.3.6.1.4.1.2021.8.1.2.0**
``.1.3.6.1.4.1.2021.8.1.2.0 = STRING: first command``
**> snmpwalk -v2c -c testing 127.0.0.1 .1.3.6.1.4.1.2021.8.1.101.0**
``.1.3.6.1.4.1.2021.8.1.101.0 = STRING: 15``
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