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Problem running gnuplot in cron job

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From	Chris Elvidge <chris@mshome.net>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Problem running gnuplot in cron job
Date	Thu, 16 May 2019 14:07:32 +0100
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Hi All, Can anyone explain this:

G N U P L O T
Version 5.2 patchlevel 6    last modified 2019-01-01

I have a bash file and a gnuplot file viz:

$ cat getfiles
#!/bin/bash
FILES=$(find /var/tmp/ -daystart -maxdepth 1 -regextype posix-awk -regex 
".*_[0-9]{8}.*" -mtime -9)
gnuplot -c /home/pi/gpts/temp_weekly.gpt $FILES

$ cat temp_weekly.gpt
#!/usr/bin/gnuplot
# vim: filetype=gnuplot
#
if (ARGC > 0) {
         do for [j=1:ARGC] { print ARGV[j] }
}

On two machines, RaspberryPis running Raspbian and OSMC, when "getfiles" 
is run from the command line, temp_weekly.gpt outputs a list of files, 
one per line, as expected.
When run from a cron job, I get an error:

print ARGV[j]
             ^
line 6: ':' expected

However on another, RPi running Void Linux, both command line and cron 
job give the expected list of files.

What am I missing here?
Thanks.

-- 

Chris Elvidge, England

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Problem running gnuplot in cron job Chris Elvidge <chris@mshome.net> - 2019-05-16 14:07 +0100

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