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I have a script working out ink percentages
#!/bin/bash
currentcyan=$'iso.3.6.1.2.1.43.11.1.1.9.1.1 = INTEGER: 990'
currentmagenta=$'iso.3.6.1.2.1.43.11.1.1.9.1.2 = INTEGER: 972'...

I finally understood how ##* works and corrected my code:
cyanperc=$(( ${currentcyan##* }*100/${maxcyan##* } ))
Worked perfectly fine :)

Thank you for your help and for not telling me what was...

Guys, thank you for the responses but I've been an idiot. With my mind in chaos I mistyped the outcome of the command.

The correct format is iso.3..6.1.2.1.43.11.1.1.9.1.1 = INTEGER: 235

Same...

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 currentcyan=$(snmpwalk -v1 - c public...

I'm trying to write a script which will calculate percentages from a printer.
I have a command snmpwalk -v1 -c public 192.168.0.20 1.3.6.1.2.1.43.11.1.1.9.1.1

which returns (current ink level):...