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Subject: Re: ENVVAR.right_trim in IOC console
From: Till Straumann 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 20:35:54 -0700
It would probably be easy to wrap std:: or boost:: regex_replace() into
a iocsh call with, e.g., 'sed'-like syntax so that you could say

epicsEnvSetSubstituted( "IOCNAME", "/(^.*)(.$)/\1/", "$(PREFIX)" )

that would give you a quite powerful tool...

HTH
- Till


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?

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)")



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

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