Re: Re: bash script - extend - output as integer

On Tue, Apr 21, 2020 at 8:14 PM Dennis Schneck <[email protected]> wrote:

>
> Hello Paul,
> thanks but exit code only max 255 (or I am wrong?) but I need 4 digets for
> example 9999
> so is there another way ?
>

From the same link:

> Integer exit codes are limited to a range of 0–255. For values that are
likely to exceed 256, either use the standard output of the script (which
will be typed as a string) or a different method of extending the agent.

So. Your options are
- use STRING anyway (their first suggestion)
- don't use extend and write a proper agent (their second)
- old-skool - use scaled integers, where 0 represents - er - 0. And 255
represents (to pick your example) 9999 - quick example of this third:

---
#!/bin/bash -u
val=${1:-0}
scaled=$((255*val/9999))
exit ${scaled}
---
$ for x in 1 10 39 40 41 250 500 5000 7500 9999; do ./scaled.sh ${x}; echo
"${x} -> $?"; done
1 -> 0
10 -> 0
39 -> 0
40 -> 1
41 -> 1
250 -> 6
500 -> 12
5000 -> 127
7500 -> 191
9999 -> 255
----

Note each unit of output represents a range of about 40 input units. If you
can 'tighten' that 0-9999 range it may improve, bur your granularity is
still stuck to 256 values.

Out of range numbers go silly with that specific script - you'd need error
checking:

$ for x in 10000 20000 30000 40000; do ./scaled.sh ${x}; echo "${x} -> $?";
done
10000 -> 255
20000 -> 254
30000 -> 253
40000 -> 252



> *Gesendet:* Dienstag, 21. April 2020 um 15:36 Uhr
> *Von:* "Paul Herring" <[email protected]>
> *An:* "Dennis Schneck" <[email protected]>
> *Cc:* [email protected]
> *Betreff:* Re: bash script - extend - output as integer
>
> https://docs.fedoraproject.org/en-US/Fedora/18/html/System_Administrators_Guide/sect-System_Monitoring_Tools-Net-SNMP-Extending.html
>
> > Note that the exit code (“8” in this example) is provided as an INTEGER
> type and any output is provided as a STRING type.
>
> You want get_TempOfRoom1.sh to exit (the return code) with the value you
> want in the INTEGER, not echo it out.
>
> On Tue, Apr 21, 2020 at 1:56 PM Dennis Schneck <[email protected]>
> wrote:
>
>>
>> Hello,
>> how to get an integer value from a bash script if using "extend" in
>> /etc/snmp/snmpd.conf ?
>>
>> extend TempOfRoom1 /scripts/get_TempOfRoom1.sh
>>
>> got only STRING but no INTEGER
>>
>>
>> NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."TempOfRoom1" = STRING: 2210
>>
>>
>> like to get:
>>
>> NET-SNMP-EXTEND-MIB::nsExtendResult."TempOfRoom1" = INTEGER: 2210 insted
>> of "NET-SNMP-EXTEND-MIB::nsExtendOutput1Line."TempOfRoom1" = STRING: 2210
>> "
>>
> --
PJH

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