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Full Discussion: Issue with null value
Top Forums Shell Programming and Scripting Issue with null value Post 302656485 by methyl on Thursday 14th of June 2012 06:52:12 PM
Old 06-14-2012
Please post what Operating System and version you are using.
Please post what Shell this is.

The solution is in the question:
"So i am looking for if xmitq is null (no value) then it should print blank for $chl and $ip."
Code:
if [ "${xmitq}""X" = "X" ]
then
       # set the other values to blank
else
       # derive the values
fi

There are tidier ways of determining if a variable is empty but this depends on the Shell you are running at the time.

Ideally post some sample input data and expected output data. We are not psychic.

Ps. I don't understand the bit about "eight" whatsoever or much or the other ramblings. A well-prepared example would help.
Has this post been through a translator from a foreign language?

Last edited by methyl; 06-14-2012 at 07:57 PM..
 

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GPIV_HDF2PIV(1) 					      General Commands Manual						   GPIV_HDF2PIV(1)

NAME
gpiv_hdf2piv - Converts HDF5 PIV-data to ASCII data. SYNOPSIS
gpiv_hdf2piv [-e] [-h | --help] [-p | --print] [-v | --version] filename DESCRIPTION
gpiv_hdf2piv converts a HDF5 formatted file filename.hdf, containing PIV-data, PIV derived data, like vorticities, strain etc to (ASCII formatted) filename.piv., filename.vor, filename.sstr, filename.nstr and, eventually, image(s) to (PNG formatted) filename.png files. The parameters that have been used for the analysis and post processing are written to filename.par This program does not use the parameter resources from libgpiv. The parameters may be defined by the command line options as explained below. Options -e Exclude PIV data and data from post-processes. Only convert image data. -h | --help On-line help. -p | --print Prints parameters, command line options and input and output filenames to stdout. The output may be used as parameters of fasty for future use by re-directing stdout to fasty.par. -v | --version Print version information on standard output, then exits successfully. filename Full input file name, hdf formatted (including .hdf extension) SEE ALSO gpivtools AUTHOR
Gerber Van der Graaf 19 Januari 2005 GPIV_HDF2PIV(1)
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