ADC 400F Manual descargar pdf (Pagina 47)

Chapter 4. More information

speciﬁed by the DAQHOST environment variable, if it is deﬁned, or localhost if not.

Consider the following script:

Example 4-3. Starting ReadoutShell ~/bin/startreadout

#!/bin/bash

. /etc/profile

. ~/.bashrc

if test "$DAQHOST" == ""

then

host=‘hostname‘ # ➊

else

host="$DAQHOST"

/usr/opt/daq/8.1/bin/ReadoutShell -host=$host \

-path=$HOME/experiment/readout/Readout # ➋

Ê This shell script code checks to see if the environment variable DAQHOST is undeﬁned or blank. If

so, then the shell script variable host is set to the name of the system the script is running on

(Readout will be run locally). If not, host is set to the value of the DAQHOST variable.

Ë These two lines start the ReadoutShell GUI telling it to run the readout program we created on the

host speciﬁed by the host variable.

The readout application we wrote does not need to know what its working directory is, it also does not

rely on any environment variables that got set by either the system wide, or user proﬁle scripts

(/etc/profile, and ~/.bashrc). It is possible that you might write a readout program that does rely

on knowing the working directory, the value of an environment variable or both. In that case, instead of

directly running the readout program, as shown in the example above, specify that the readout program is

itself a shell script that will source the appropriate proﬁles and set the appropriate working directory.

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ADC 400F Manual Pagina 47