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Full Discussion: gnuplot do not take my variable
Top Forums Shell Programming and Scripting gnuplot do not take my variable Post 302643507 by bakunin on Saturday 19th of May 2012 03:53:44 PM
Old 05-19-2012
I could be wrong, but the last line looks problematic:

Quote:
Originally Posted by IMPe
Code:
M=$`date +%m`
D=$`date +%d`
Ma=$`date --date="$Z days ago" +%m`
Da=$`date --date="$Z days ago" +%d`
[...]
set xrange [ "Ma/Da/12":"M/D/12" ]

You create some variables (D, M, Da, Ma) but you never use them. Instead you use fixed strings ("D", "M", ...).

If you want to use a variables content (as opposed to its name) you have to prepend it with "$". To avoid ambiguity you can also enclose the variables name with curly braces ("{}"). So the last line should probably look like this:

Code:
set xrange [ "${Ma}/${Da}/12":"${M}/${D}/12" ]

Further, you should not use the backticks, even if they work. Backticks are an ancient construct and only supported for legacy purposes. Use the "$(...)" instead. That means change:

Code:
M=`date +%m`

to

Code:
M="$(date +%m)"

and accordingly with similar lines.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
IMPe
 

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LEARN ABOUT CENTOS

bno_plot

BNO_PLOT(1)															       BNO_PLOT(1)

NAME

       bno_plot - generate interactive 3D plot of IO blocks and sizes

SYNOPSIS

       bno_plot [ -h | --help ]
		[ -v | --verbose ]
		[ -K | --keys-below ]
		[ <file...> ]

DESCRIPTION

       bno_plot  is  a	visualization  tool  for the block layer IO tracing tool called blktrace(8).  As noted in its documentation, blktrace is a
       block layer IO tracing mechanism which provides detailed information about request queue operations up to user space.

       bno_plot utilizes gnuplot to generate a 3D plot of the block number output from btt.  If no <files> are	specified,  it	will  utilize  all
       files generated after btt was run with -B blknos (meaning: all files of the form blknos*[rw].dat).

       The -K option forces bno_plot to put the keys below the graph.  If it is not specified, all keys for input files are put in the upper right
       corner of the graph. If the number of devices exceed 10, then bno_plot will automatically push the keys under the graph.

       To use this utility, the gnuplot package needs to be installed.

       To exit the plotter, enter 'quit' or ^D at the 'gnuplot> ' prompt.

AUTHORS

       bno_plot was written by Alan D. Brunelle.  This man page was created from the blktrace documentation by Bas Zoetekouw.

REPORTING BUGS

       Report bugs to <linux-btrace@vger.kernel.org>

COPYRIGHT

       Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
       This  is  free  software.   You	 may   redistribute   copies   of   it	 under	 the   terms   of   the   GNU	General   Public   License
       <http://www.gnu.org/licenses/gpl.html>.	There is NO WARRANTY, to the extent permitted by law.
       This  manual  page  was	created  for Debian by Bas Zoetekouw.  It was derived from the documentation provided by the authors and it may be
       used, distributed and modified under the terms of the GNU General Public License, version 2.
       On Debian systems, the text of the GNU General Public License can be found in /usr/share/common-licenses/GPL-2.

SEE ALSO

       btt (1), gnuplot (1), blktrace (8), blkparse (1), verify_blkparse (1), blkrawverify (1)

blktrace git-20080213182518					 February 22, 2007						       BNO_PLOT(1)
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