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Full Discussion: Bash : More parameter expansion and IFS
Top Forums Shell Programming and Scripting Bash : More parameter expansion and IFS Post 303018402 by sumguy on Tuesday 5th of June 2018 01:12:37 PM
Old 06-05-2018
Bash : More parameter expansion and IFS
I am trying to become more fluent with the interworking of bash and minimize the number of external calls.

Sample Data. This will be the response of the snmp query.
Code:
SNMPv2-MIB::sysName.0 = STRING: SomeHostName
SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.9.1.1745
SNMPv2-MIB::sysDescr.0 = STRING: Cisco IOS Software, IOS-XE Software, Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 03.06.08.E RELEASE SOFTWARE (fc1)

I would like to extract as follows:
Code:
sysD=03.06.08.E 
sysN=SomeHostName
sysO=1745

The code given below does this. But its ugly and is very dependant on external calls.

I reviewed Chris FA Johnsons site / link Extracting parts of a string by Chris F.A. Johnson and reviewed a few books I have written by him and looked at web resources and dont find a good method to execute the same without external calls.

Is there anyway I can isolate these pieces of information without external calls ?

Code:
 
sult=$($SNMPG $RW -v2c -mALL $i sysDescr.0 sysName.0 sysObjectID.0 2>/dev/null)
sysD=$(echo "$sult" | grep "sysDescr" | sed 's/.*, Version //g; s/ RELEASE.*//g; s/,$//g')
sysN=$(echo "$sult" | grep "sysName" | awk '{print $NF}')
sysO=$(echo "$sult" | grep "sysObjectID" | sed 's/.*enterprises//g' | cut -d"." -f4)
printf "%s," "$sysN" "$sysD" "$sysO";printf "%s\n" | tee -a ofil.csv

Thanks for all your help !!
Last edited by RudiC; 06-05-2018 at 02:18 PM..
 

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LEARN ABOUT CENTOS

snmptranslate

SNMPTRANSLATE(1)						     Net-SNMP							  SNMPTRANSLATE(1)

NAME

       snmptranslate - translate MIB OID names between numeric and textual forms

SYNOPSIS

       snmptranslate [OPTIONS] OID [OID]...

DESCRIPTION

       snmptranslate  is  an  application that translates one or more SNMP object identifier values from their symbolic (textual) forms into their
       numerical forms (or vice versa).

       OID is either a numeric or textual object identifier.

OPTIONS

       -D[TOKEN[,...]]
	       Turn on debugging output for the given TOKEN(s).  Try ALL for extremely verbose output.

       -h      Display a brief usage message and then exit.

       -m MIBLIST
	       Specifies a colon separated list of MIB modules to load for this application.  This overrides the environment variable MIBS.

	       The special keyword ALL is used to specify all modules in all directories when searching for MIB files.	Every file whose name does
	       not begin with "." will be parsed as if it were a MIB file.

       -M DIRLIST
	       Specifies a colon separated list of directories to search for MIBs.  This overrides the environment variable MIBDIRS.

       -T TRANSOPTS
	       Provides control over the translation of the OID values.  The following TRANSOPTS are available:

	       -Td   Print full details of the specified OID.

	       -Tp   Print a graphical tree, rooted at the specified OID.

	       -Ta   Dump the loaded MIB in a trivial form.

	       -Tl   Dump a labeled form of all objects.

	       -To   Dump a numeric form of all objects.

	       -Ts   Dump a symbolic form of all objects.

	       -Tt   Dump a tree form of the loaded MIBs (mostly useful for debugging).

	       -Tz   Dump a numeric and labeled form of all objects (compatible with MIB2SCHEMA format).

       -V      Display version information for the application and then exit.

       -w WIDTH
	       Specifies the width of -Tp and -Td output. The default is very large.

       In  addition  to  the  above options, snmptranslate takes the OID input (-I), MIB parsing (-M) and OID output (-O) options described in the
       INPUT OPTIONS, MIB PARSING OPTIONS and OUTPUT OPTIONS sections of the snmpcmd(1) manual page.

EXAMPLES

       o   snmptranslate -On -IR sysDescr
	   will translate "sysDescr" to a more qualified form:

	   system.sysDescr

       o   snmptranslate -Onf -IR sysDescr
	   will translate "sysDecr" to:

	   .iso.org.dod.internet.mgmt.mib-2.system.sysDescr

       o   snmptranslate -Td -OS system.sysDescr
	   will translate "sysDecr" into:

	   SNMPv2-MIB::sysDescr
	   sysDescr OBJECT-TYPE
	     -- FROM SNMPv2-MIB
	     -- TEXTUAL CONVENTION DisplayString
	     SYNTAX OCTET STRING (0..255)
	     DISPLAY-HINT "255a"
	     MAX-ACCESS read-only
	     STATUS current
	     DESCRIPTION "A textual description of the entity. This
			  value should include the full name and
			  version identification of the system's
			  hardware type, software operating-system,
			  and networking software."
	   ::= { iso(1) org(3) dod(6) internet(1) mgmt(2) mib-2(1) system(1) 1 }

       o   snmptranslate -Tp -OS system
	   will print the following tree:

	   +--system(1)
	      |
	      +-- -R-- String	 sysDescr(1)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -R-- ObjID	 sysObjectID(2)
	      +-- -R-- TimeTicks sysUpTime(3)
	      +-- -RW- String	 sysContact(4)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -RW- String	 sysName(5)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -RW- String	 sysLocation(6)
	      |        Textual Convention: DisplayString
	      |        Size: 0..255
	      +-- -R-- Integer	 sysServices(7)
	      +-- -R-- TimeTicks sysORLastChange(8)
	      |        Textual Convention: TimeStamp
	      |
	      +--sysORTable(9)
		 |
		 +--sysOREntry(1)
		    |
		    +-- ---- Integer   sysORIndex(1)
		    +-- -R-- ObjID     sysORID(2)
		    +-- -R-- String    sysORDescr(3)
		    |	     Textual Convention: DisplayString
		    |	     Size: 0..255
		    +-- -R-- TimeTicks sysORUpTime(4)
			     Textual Convention: TimeStamp

       o   snmptranslate -Ta | head
	   will produce the following dump:

	   dump DEFINITIONS ::= BEGIN
	   org ::= { iso 3 }
	   dod ::= { org 6 }
	   internet ::= { dod 1 }
	   directory ::= { internet 1 }
	   mgmt ::= { internet 2 }
	   experimental ::= { internet 3 }
	   private ::= { internet 4 }
	   security ::= { internet 5 }
	   snmpV2 ::= { internet 6 }

       o   snmptranslate -Tl | head
	   will produce the following dump:

	   .iso(1).org(3)
	   .iso(1).org(3).dod(6)
	   .iso(1).org(3).dod(6).internet(1)
	   .iso(1).org(3).dod(6).internet(1).directory(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysDescr(1)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysObjectID(2)
	   .iso(1).org(3).dod(6).internet(1).mgmt(2).mib-2(1).system(1).sysUpTime(3)

       o   snmptranslate -To | head
	   will produce the following dump

	   .1.3
	   .1.3.6
	   .1.3.6.1
	   .1.3.6.1.1
	   .1.3.6.1.2
	   .1.3.6.1.2.1
	   .1.3.6.1.2.1.1
	   .1.3.6.1.2.1.1.1
	   .1.3.6.1.2.1.1.2
	   .1.3.6.1.2.1.1.3

       o   snmptranslate -Ts | head
	   will produce the following dump

	   .iso.org
	   .iso.org.dod
	   .iso.org.dod.internet
	   .iso.org.dod.internet.directory
	   .iso.org.dod.internet.mgmt
	   .iso.org.dod.internet.mgmt.mib-2
	   .iso.org.dod.internet.mgmt.mib-2.system
	   .iso.org.dod.internet.mgmt.mib-2.system.sysDescr
	   .iso.org.dod.internet.mgmt.mib-2.system.sysObjectID
	   .iso.org.dod.internet.mgmt.mib-2.system.sysUpTime

       o   snmptranslate -Tt | head
	   will produce the following dump

	     org(3) type=0
	       dod(6) type=0
		 internet(1) type=0
		   directory(1) type=0
		   mgmt(2) type=0
		     mib-2(1) type=0
		       system(1) type=0
			 sysDescr(1) type=2 tc=4 hint=255a
			 sysObjectID(2) type=1
			 sysUpTime(3) type=8

SEE ALSO

       snmpcmd(1), variables(5), RFC 2578-2580.

V5.7.2								    20 Jul 2010 						  SNMPTRANSLATE(1)
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