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Full Discussion: command to grep the variable from file
Top Forums Shell Programming and Scripting command to grep the variable from file Post 302575871 by dbashyam on Wednesday 23rd of November 2011 05:19:06 AM
Old 11-23-2011
command to grep the variable from file
Hi,

I am looking for the following:

1. A command to 'grep' the variable from a file
2. And check whether the entered variable is empty in that file

I have a file as given below:

IAGLOBAL_USERID=admin

I want to check with a whether the variable contains a value, say here its admin if it contains value I will proceed ahead else I should give three tries for the user if in those three tries if the user does not enter the userid then I will exit.

I did the following:

Code:
var1=`cat $NCO/response_uid.txt | grep -i IAGLOBAL_WASUserID | cut -d'=' -f1`
var2=$(echo "${var1}" | sed -e 's/^ *//g;s/ *$//g')
echo $var2
if [ -z "$var2" ];
then
rm -rf $NCO/response_uid.txt
rm -rf $NCO/response_def.txt
exit 1;
fi

Any ideas?

Thanks,
Dinesh
 

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LEARN ABOUT DEBIAN

nco

NCO(1)							      General Commands Manual							    NCO(1)

NAME

       NCO - netCDF Operators

SYNTAX

       operator [ options] input-files output-file

DESCRIPTION

       The netCDF Operators, or NCO are a suite of programs known as operators.  Each operator is a standalone, command line program which is exe-
       cuted at the UNIX shell-level like, e.g., ls or mkdir.  The operators take netCDF (<http://www.unidata.ucar.edu/packages/netcdf>) files	as
       input,  then perform a set of operations (e.g., deriving new data, averaging, hyperslabbing, or metadata manipulation) and produce a netCDF
       file as output.	The operators are primarily designed to aid manipulation and analysis of gridded  scientific  data.   The  single  command
       style  of  NCO  allows  users to manipulate and analyze files interactively and with simple scripts, avoiding the overhead (and some of the
       power) of a higher level programming environment.  The NCO User's Guide illustrates their use with examples from the field of climate  mod-
       eling and analysis.

       The available operators are:

	      ncap2, netCDF Arithmetic Processor
	      ncatted, netCDF Attribute Editor
	      ncbo, netCDF Binary Operator (includes ncadd, ncsubtract, ncmultiply, ncdivide)
	      ncea, netCDF Ensemble Averager
	      ncecat, netCDF Ensemble Concatenator
	      ncflint, netCDF File Interpolator
	      ncks, netCDF Kitchen Sink
	      ncpdq, netCDF Permute Dimensions Quickly, Pack Data Quietly
	      ncra, netCDF Record Averager
	      ncrcat, netCDF Record Concatenator
	      ncrename, netCDF Renamer
	      ncwa, netCDF Weighted Averager.
       (Note that the "averagers" are misnamed because they perform many non-linear operations as well, e.g., total, minimum, maximum, RMS).

       The operators are as general as netCDF itself: there are no restrictions on the contents of the netCDF file(s) used as input.  NCO's inter-
       nal routines are completely dynamic and impose no limit on the number or sizes of dimensions, variables, and files.  NCO is designed to	be
       used  both  interactively  and  with large batch jobs.  The default operator behavior is often sufficient for everyday needs, and there are
       numerous command line (i.e., run-time) options, for special cases.  NCO works well on all modern operating systems.

AUTHOR

       NCO manual pages written by Charlie Zender and Brian Mays.

REPORTING BUGS

       Report bugs to <http://sf.net/bugs/?group_id=3331>.

COPYRIGHT

       Copyright (C) 1995-2010 Charlie Zender
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The  full  documentation for NCO is maintained as a Texinfo manual called the NCO User's Guide.	Because NCO is mathematical in nature, the
       documentation includes TeX-intensive portions not viewable on character-based displays.	Hence the only complete and authoritative versions
       of   the   NCO	User's	 Guide	 are   the   PDF   (recommended),   DVI,   and	 Postscript   versions	 at   <http://nco.sf.net/nco.pdf>,
       <http://nco.sf.net/nco.dvi>,   and   <http://nco.sf.net/nco.ps>,   respectively.    HTML   and	 XML	versions    are    available	at
       <http://nco.sf.net/nco.html> and <http://nco.sf.net/nco.xml>, respectively.

       If the info and NCO programs are properly installed at your site, the command

	      info nco

       should give you access to the complete manual, except for the TeX-intensive portions.

       ncap2(1),  ncatted(1),  ncbo(1),  ncdiff(1),  ncea(1),  ncecat(1),  ncflint(1), ncks(1), nco(1), ncpdq(1), ncra(1), ncrcat(1), ncrename(1),
       ncwa(1)

HOMEPAGE

       The NCO homepage at <http://nco.sf.net> contains more information.

																	    NCO(1)
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