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Full Discussion: Print matching lines in a file
Top Forums Shell Programming and Scripting Print matching lines in a file Post 302472743 by k_manimuthu on Thursday 18th of November 2010 02:53:55 AM
Old 11-18-2010
I assumed you passed three arguments in the program.

Argument 1 : input file
Argument 2 : output file
Argument 3 : your regex

Code:
($regex) = @ARGV;

For the above code $regex get the input file name only. So you not able get the desired output. You must assign the third argument as $regex.

I slightly modify your code. Try this
Code:
die "Usage infile outfile reGex" if @ARGV != 3;
($regex) = $ARGV[2];
open(F,$ARGV[0]) or die "Can't open";
open(FOUT,"+>$ARGV[1]") or die "Can't open";
while (<F>)
{
  # $_ is a default variable
  # if your regex match the line you get the line into $ARGV[1] file
  print FOUT "$_" if ($_ =~ /$regex/);
}

Last edited by k_manimuthu; 11-18-2010 at 03:55 AM.. Reason: comment added
 

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LEARN ABOUT DEBIAN

shprewind

SHAPELIB(1)							   User Commands						       SHAPELIB(1)

NAME

       shprewind - fix polygon ring orientations in ESRI shapefiles

SYNOPSIS

       shprewind infile outfile

DESCRIPTION

       Makes  a  copy of the shapefile infile to outfile and fixes the orientation of points in the rings of Polygon, PolygonZ, and PolygonM typed
       shapes to conform to the shapefile specification.  According to the specification, the vertices of outer rings should be oriented clockwise
       on the X/Y plane, and those of inner rings counterclockwise.

       Shapefiles  actually  consist of two files with the same basename and extensions .shp and .shx (or .SHP and .SHX) containing the shape data
       and shape index respectively.  The files to open are determined by first stripping any filename extension from  infile  and  attempting	to
       open  the  files  infile.shp or infile.SHP, and infile.shx or infile.SHX for the respective data and index files.  The files to create from
       outfile are determined by stripping any filename extension from outfile and appending .shp and .shx suffixes for the  respective  data  and
       index files.

EXIT STATUS

       0      Successful program execution.

       1      Missing infile or outfile arguments, failed to open shapefile infile or create shapefile outfile.

DIAGNOSTICS

       The following diagnostics may be issued on stdout:

       Unable to open:infile

       Unable to create:outfile

       count objects rewound.

AUTHORS

       Frank  Warmerdam (warmerdam@pobox.com) is the maintainer of the shapelib shapefile library.  Joonas Pihlaja (jpihlaja@cc.helsinki.fi) wrote
       this man page.

BUGS

       The implementation assumes that there is at most one outer ring in each shape, that it is the first ring in a shape, and all other rings in
       a shape are inner rings.  Polygons inside MultiPatch shape types aren't rewound.

SEE ALSO

       dbfadd(1), dbfcreate(1), dbfdump(1), dbf_dump(1), shpadd(1), shpcreate(1), shpdump(1)

shapelib							   OCTOBER 2004 						       SHAPELIB(1)
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