Thread: SAC and sh issue

Ray,

This may not be a SAC problem.

Do you have write permission for the file? Is the file actually in the
location you intend it to be?

File “ttsac.pcf" will be put in the current directory, because of the
leading ./ in the name in line

file=./ttsac.pcf

Also, I don’t use ’sh’, but I’m puzzled by the purpose of the line

cat /dev/null > $file

With csh, if the file does not exist, it will be created by the line

echo '[f3hcvbss]' >> $file

And if you want to assure you are not appending to an existing file, why
not delete the file first? If the file does not exist, “rm” will just
complain, but so what?

Except for the ./ putting the file into the current directory, the script
should work. Provided the file is writable. If it isn’t writable, you
should get a Permission denied message.

If you make up a simple sequence of steps for the shell script, you may be
able to enter each line individually and verify you have the result you
want.

Good luck,

Leigh

On Jun 18, 2021, at 12:46 PM, Ray Russo (via IRIS) <

sac-help-bounce<at>lists.ds.iris.edu> wrote:

Hi -

I'm trying to use a SAC macro+sh script that dates back decades, ttsac.

Here's the issue, which as far as I know is specific to the recent SAC 102
release.

The macro calls the shell script and the shellscript is supposed to

write drop files to /tmp for later use by plotc. However, the shell script
generates only an empty file, /tmp/ttsac.pcf. The problem exists for both
my long-in-the-tooth personal version and George's version from the SACbook
github site.

Operative lines of code are:

macro:

* Build annotation information for display and limits in macro

./ttsac.xlim

$run /Users/ray/splitting/macros/ttsac.sh
.
.
.
* Generate plot, then annotate it
bf;p1;plotc replay file ./ttsac;ef

sh script:

file=./ttsac.pcf
.
.
.
cat /dev/null > $file
.
.
.
echo '[f3hcvbss]' >> $file
etc.

The file /tmp/ttsac.pcf is created, but none of the subsequent echo

commands writes anything to the file.

I've attempted lots of fixes, but no joy.

Any ideas?

Thanks,

Ray

--
R. M. Russo
Associate Professor, Graduate Coordinator
Department of Geological Science
University of Florida
Gainesville, FL 32611 USA
+1 352 392 6766
+1 352 392 9294 fax
rrusso<at>ufl.edu for all University of Florida business
rmrusso2010<at>gmail.com for all other contacts


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