RE: Running Linux commands inside 'st.cmd'

[Mark Rivers <rivers@cars.uchicago.edu>]

You can run Linux commands from st.cmd with the "system" command:

system "echo 113 > /sys/class/gpio/export"

However, the iocsh "system" command is not enabled by default for security reasons.  This is from the IOC Application Developers Guide:

***************************************************
system command_string
Send command_string to the system command interpreter for execution. This command is present
only if some application database definition file contains registrar(iocshSystemCommand)
and if the system provides a suitable command interpreter (vxWorks does not).
***************************************************

Mark


________________________________
From: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Amien Crombie [acrombie@tlabs.ac.za]
Sent: Thursday, February 20, 2014 7:09 AM
To: tech-talk@aps.anl.gov
Subject: Running Linux commands inside 'st.cmd'

Hi

I have the following ‘st.cmd’

#!../../bin/linux-arm/ioc48
< envPaths
cd ${TOP}

## Want to add the ‘echo’ Linux command but it fails
## echo 113 > /sys/class/gpio/export

dbLoadDatabase "dbd/ioc48.dbd"
ioc48_registerRecordDeviceDriver pdbbase
int32DriverInit("int32",-32768,32767)
dbLoadTemplate "db/iocPV.substitutions"
set_savefile_path("../save")
set_pass1_restoreFile("channelmap.sav")
set_pass1_restoreFile("channelspacing.sav")
save_restoreSet_DatedBackupFiles(1)
save_restoreSet_NumSeqFiles(3)
save_restoreSet_SeqPeriodInSeconds(6000)
save_restoreSet_RetrySeconds(120)

cd ${TOP}/iocBoot/${IOC}
iocInit
dbpf devx:range 1


Either EPICS’s st.cmd cannot run Linux commands or I’m doing something wrong.
Thanks
Amien
Cape Town

Mogamad Amien Crombie
NRF : iThemba LABS
EIT Group
Laboratory for Accelerator Based Sciences
Somerset West, Western Cape
South Africa

[cid:B5985B326A16C23E725D305CEF1DEFCEF046B8F1@cars.uchicago.edu]