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Subject: Re: ENVVAR.right_trim in IOC console
From: Michael Davidsaver via Tech-talk <tech-talk@aps.anl.gov>
To: "Jemian, Pete R." <jemian@anl.gov>, EPICS Tech Talk <tech-talk@aps.anl.gov>
Date: Sun, 29 Sep 2019 20:25:20 -0700
On 9/29/19 6:35 PM, Jemian, Pete R. via Tech-talk wrote:
> 
> Working in the IOC shell (EPICS base 7.0.3), how to remove the last 
> character from an EPICS environment variable?

I don't think there is any way to do this at present.
The IOC shell isn't a fully featured shell/programming language.


> given this definition:   epicsEnvSet(PREFIX, "xxx:")
> I want to achieve this result: "xxx" by somehow editing $(PREFIX) in place.
> 
> In bash, this is possible using ${PREFIX::-1} but in the IOC shell:
> 
> iocxxx> echo $(PREFIX::-1)
> macLib: macro PREFIX::-1 is undefined (expanding string echo $(PREFIX::-1))
> 
> 
> The context is I want to change this line from:
> 
> dbLoadRecords("some.db","IOCNAME=$(PREFIX)")
> 
> to:
> 
> dbLoadRecords("some.db","IOCNAME=$(PREFIX - 1 character)")

I think you'll have to resort to doing this the other way around.

epicsEnvSet("IOCNAME", "blah")
epicsEnvSet("PREFIX", "$(IOCNAME):")

Replies:
Re: ENVVAR.right_trim in IOC console Eric Norum via Tech-talk
References:
ENVVAR.right_trim in IOC console Jemian, Pete R. via Tech-talk

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