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GNUPLOTING issue

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# 1  
Old 01-12-2015
GNUPLOTING issue
Need assistance in troubleshooting

I have written a script using GNUPLOT . It works great when i run manually but when i put in crontab it give me library file missing. Any inputs are highly appreciated.

Code:
#!/local/tools/monitoring/gnuplot-new/bin/gnuplot

set terminal png size 1024,768
set output 'graph.png'
set title "System monitoring"
set xlabel "time"
set key outside bottom
set ylabel "%"
set ytics format '%s%c'
set yrange [1:1024**2]
set autoscale
set grid
set xdata time
set format x "%H:%M"
set timefmt "%d-%m %H:%M:%S"
set ylabel "GB"
plot "testmemory.csv" using 1:3 title "used" with lines,\
"testmemory.csv" using 1:4 title "buffered" with lines,\
"testmemory.csv" using 1:5 title "cached" with lines,\
"testmemory.csv" using 1:6 title "free" with lines

When run through crontab this gives me below error.
Code:
gnuplot: error while loading shared libraries: libwx_gtk2u_xrc-3.0.so.0: cannot open shared object file: No such file
 or directory

# 2  
Old 01-12-2015
Well, where is this file located on your system?
# 3  
Old 01-12-2015
In scripts I run with cron I add a line like this...
Code:
# Because cron doesn't run in your local environs
source $HOME/.bash_profile >&/dev/null

You could try something like -- export PATH=$PATH:/your/libs/path
# 4  
Old 01-12-2015
My shell is tcsh .



It is located not in the user directory in a different /var/tmp location .

---------- Post updated at 12:54 PM ---------- Previous update was at 12:44 PM ----------

ongoto: I dont have a .bash_profile under the $HOME directory.

GNUPLOT doesnt have a lib directory to export.

Code:
drwxrwxr-x. 2 weather weather 4096 Jan 12 17:26 bin
drwxrwxr-x. 3 weather weather 4096 Jan 12 17:26 libexec
drwxrwxr-x. 5 weather weather 4096 Jan 12 17:26 share

# 5  
Old 01-12-2015
Quote:
When run through crontab this gives me below error.
Code:
gnuplot: error while loading shared libraries: libwx_gtk2u_xrc-3.0.so.0: cannot open shared object file: No such file
 or directory

OK. I see you are using tcsh.
If you can locate libwx_gtk2u_xrc-3.0.so.0 on your system (as Corona688 posted earlier), I was thinking you could add the path to that file in the PATH env variable, and then export it from within your script. If you can't locate that lib file, then you have other issues with gnuplot itself or your distro.

Have you tested running your script directly ( not using cron )?
Last edited by ongoto; 01-12-2015 at 03:22 PM..
# 6  
Old 01-12-2015
ongoto

running directly works without any errors .

Gnuplot doesnt have a lib directory. This lib file is located with other application called wx-widgets . That was also exported under .cshrc file . Gnuplot uses wx-widgets as well.
# 7  
Old 01-12-2015
OK. Then it's a cron issue.
It's not about libwx_gtk2u_xrc-3.0.so belonging to gnuplot. It's a library shared by lots of applications like you said.
So I say again...help cron find the shared library file. Cron runs in a very minimal
environment and doesn't know where to search for files needed by other applications. Gnuplot will be running as a child process of Cron and will be running in Cron's 'blind' environment.
You'll have to edit your script and see if this works or not.
On my system this file is in /usr/lib64
Code:
#!/local/tools/monitoring/gnuplot-new/bin/gnuplot

export PATH="$PATH:/usr/lib?"     ## the directory where you found libwx_gtk2u_xrc-3.0.so.

set terminal png size 1024,768
set output 'graph.png'
...
...

Last edited by ongoto; 01-12-2015 at 05:48 PM..
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