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Full Discussion: Extracting vaules from end of string
Top Forums Shell Programming and Scripting Extracting vaules from end of string Post 302986808 by apmcd47 on Wednesday 30th of November 2016 09:35:44 AM
Old 11-30-2016
Quote:
Originally Posted by leshy93
Thank you for the information.
I'm working on a Raspberry Pi 3 running Ubuntu Mate. GNU, version 4.3.46(1)

From the bash script I run:
first command
Code:
currentcyan=$(snmpwalk -v1 - c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.9.1.1)

which returns iso.3.6.1.2.1.43.11.1.1.9.1.1 = INTEGER 235

second command
Code:
maxcyan=$(snmpwalk -v1 -c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.8.1.1)

which returns iso.3.6.1.2.1.43.11.1.1.8.1.1 = INTEGER 1800

I already assigned the output of the commands to variables now I need a flexible way of extracting the number after 'INTEGER'.
How about:
Code:
currentcyan=$(snmpwalk -v1 - c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.9.1.1)
currentcyan=${currentcyan##* }
maxcyan=$(snmpwalk -v1 -c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.8.1.1)
maxcyan=${maxcyan##* }

or possibly
Code:
currentcyan=$(snmpwalk -v1 - c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.9.1.1)
maxcyan=$(snmpwalk -v1 -c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.8.1.1)
cyanperc=$((  ${currentcyan##* } * 100 / ${maxcyan##* } ))

The ${var##*x removes everything (thanks to the *) from the beginning to the last x (which in the above example is a space) One # is a "non-greedy" version while using %% and % work from the end.

Andrew
This User Gave Thanks to apmcd47 For This Post:
leshy93
 

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