EPICS EDM: Passing PV values to shell commands

Experimental Physics and Industrial Control System

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Subject:	EDM: Passing PV values to shell commands
From:	"Hayton, TG (Tim) " <[email protected]>
To:	"'[email protected]'" <[email protected]>
Date:	Tue, 6 Jan 2004 16:41:42 -0000

Does anyone know if it's possible to pass PV values as arguments to a
program called from an EDM ShellCommand widget?

I can pass EDM macro substitutions easily, simply by passing them as args in
the Shell Command property, e.g.

myShellCommand $(device)

but I cannot seem to pass PV values this way, e.g.

myShellCommand ioc1:myPv
or
myShellCommand $(ioc1:myPv)

doesn't work. Am I missing any obvious syntax, or alternatively does anyone
know if it might be possible to modify EDM relatively easily to support
this?

I could of course just call the shell command with the PV name, and then do
a ca_get from there to get the value, but this seems untidy.

Many thanks

Tim Hayton
Diamond Light Source
[email protected]

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