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Top Forums Shell Programming and Scripting search string in a file and retrieve 10 lines including string line Post 302446155 by sukrish on Wednesday 18th of August 2010 02:14:42 AM
Old 08-18-2010
Thanks a lot guys...

Now i have the code which search for the string and put it in diff file but its executing only once evn though the name is present many at times in the file... i guess i need to give a condition to search till file ends ...

ranjithpr;

I used awk command it works fine if i want to print but can u pls tell me how to use this command so that it will print it in a file ? and also i found out that if the search string contains double cotes perl code will exit saying syntax error ... any suggestion ?

am using it like this inside perl
Code:
system "( awk '/Error "no1"/ {for(i=0;i<12;i++) {print; if(!getline) exit;} }' filename)';

or shall i use it in this way open file and use awk command to push all needful data ?

open (FSEARCH, '<', $filename) or die "could not read file $filename : $! \n";
while (my $line = <FSEARCH>) {
if ($line =~ m/$search_string/) {
@to_write = $line;


open (FWRITE, '>', $new_filename) or die "could not write file $new_filename : $! \n";
print FWRITE @to_write;
print "\n\n string has been written to $new_filename\n\n";


system "(awk '/Error "no1"/ {for(i=0;i<12;i++) {print FWRITE;if(!getline) exit;} }' $filename)";
print "\n Error Printed \n";
close (FWRITE);
}
}
close (FSEARCH);

Last edited by Yogesh Sawant; 08-25-2010 at 01:55 AM.. Reason: added code tags
 

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RAKE(1) 						 Ruby Programmers Reference Guide						   RAKE(1)

NAME
rake -- Ruby Make SYNOPSIS
rake [--f Rakefile] [--version] [-CGNPgnqstv] [-D [PATTERN]] [-E CODE] [-I LIBDIR] [-R RAKELIBDIR] [-T [PATTERN]] [-e CODE] [-p CODE] [-r MODULE] [--rules] [variable=value] target ... DESCRIPTION
Rake is a simple ruby(1) build program with capabilities similar to the regular make(1) command. Rake has the following features: o Rakefiles (Rake's version of Makefiles) are completely defined in standard Ruby syntax. No XML files to edit. No quirky Makefile syntax to worry about (is that a tab or a space?). o Users can specify tasks with prerequisites. o Rake supports rule patterns to synthesize implicit tasks. o Flexible FileLists that act like arrays but know about manipulating file names and paths. o A library of prepackaged tasks to make building rakefiles easier. OPTIONS
--version Display the program version. -C --classic-namespace Put Task and FileTask in the top level namespace -D [PATTERN] --describe [PATTERN] Describe the tasks (matching optional PATTERN), then exit. -E CODE --execute-continue CODE Execute some Ruby code, then continue with normal task processing. -G --no-system --nosystem Use standard project Rakefile search paths, ignore system wide rakefiles. -I LIBDIR --libdir LIBDIR Include LIBDIR in the search path for required modules. -N --no-search --nosearch Do not search parent directories for the Rakefile. -P --prereqs Display the tasks and dependencies, then exit. -R RAKELIBDIR --rakelib RAKELIBDIR --rakelibdir RAKELIBDIR Auto-import any .rake files in RAKELIBDIR. (default is rakelib ) -T [PATTERN] --tasks [PATTERN] Display the tasks (matching optional PATTERN) with descriptions, then exit. -e CODE --execute CODE Execute some Ruby code and exit. -f FILE --rakefile FILE Use FILE as the rakefile. -h --help Prints a summary of options. -g --system Using system wide (global) rakefiles (usually ~/.rake/*.rake ). -n --dry-run Do a dry run without executing actions. -p CODE --execute-print CODE Execute some Ruby code, print the result, then exit. -q --quiet Do not log messages to standard output. -r MODULE --require MODULE Require MODULE before executing rakefile. -s --silent Like --quiet, but also suppresses the 'in directory' announcement. -t --trace Turn on invoke/execute tracing, enable full backtrace. -v --verbose Log message to standard output (default). --rules Trace the rules resolution. SEE ALSO
ruby(1) make(1) http://rake.rubyforge.org/ REPORTING BUGS
Bugs, features requests and other issues can be logged at <http://onestepback.org/redmine/projects/show/rake>. You will need an account to before you can post issues. Register at <http://onestepback.org/redmine/account/register>. Or you can send an email to the author. AUTHOR
Rake is written by Jim Weirich <jim@weirichhouse.org> UNIX
November 7, 2012 UNIX
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