Missing Assigned Variable within logic operator Post: 302403535

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

What does $? mean when assigned to a variable?

If i write this statement in a Korn Shell script RCODE=$? what possibly does it eman?

2. Shell Programming and Scripting

Check if a variable has a value assigned?

Hi, I want to check if a variable has a value assigned to it or not. I can do following - cat $Var > File1 if then echo "$Var has value" else echo "$Var is null" fi But I have to check for 3 Variables and I want to wrap it up in couple of unix statements. Any...

3. Shell Programming and Scripting

unary operator is missing

hi , i m getting an error unary operator is missing. pls check why is this so? i=5 while test $i !=0 do echo $i i=`expr $i - 1` done

4. Shell Programming and Scripting

[Bash] Variable won't get assigned value

I am making of a script that will go through a couple of for loops and create file names based on the values in that loop, however the variable that combines everything is not getting assigned properly: #! /bin/bash for imod in K33_j1b_WS9_6 do for emod in mb2A mb2C mb3A mb3C mb4A...

5. Shell Programming and Scripting

How to use logic NOT operator for multiple AND conditions

Hi, my requirement is that my builds should not be built if the current hour is greater 3 but not (between 12 and 15), I'm trying to write a shell script for this but there is always an error hour=$1 echo "hour:$hour" if && ! && ]; then echo "exit" else echo "enter" fi ...

6. Shell Programming and Scripting

How to split a data assigned to a variable

The requirement is, there is a log file which contains a huge data. i need to get a particular field out of it by searching with another field. ex: 2011-03-28 13:00:07,423 : millis=231 q={ call get_data_account(?,?,?,?,?) }, params= i need to search for the word "get_data_account" in file...

7. UNIX for Dummies Questions & Answers

How do you check if a variable has been assigned?

I am trying to check whether a variable has been assigned on the command line or not. Here is what I did: #!/usr/bin/bash if( $variable == '\0') { print "variable was not assigned" exit } else NF = 2 {print $1, ""} exit fi awk -f question1.awk variable = 58 letters.txt. So...

8. Shell Programming and Scripting

Perl multiple qr assigned to variable

Experts, I'm having problems with the code below. I'm trying to test $var2 for two different regexs. I thought it could be done per below, but I'm getting the following error when running. $ ./test.pl b fed50c0100**** Unescaped left brace in regex is deprecated, passed through in regex; marked...

9. Programming

Missing Logic Looping Through Switch Statement

Having trouble with the logic when looping over this switch case again: for (j = 0; data != 0; j++){ switch(data){ case 'c': output = ranit(r_brace_array); break; case 'h': output = ranit(pipe_array); break; ...

LEARN ABOUT MOJAVE

dbd::gofer::transport::corostream5.18

DBD::Gofer::Transport::corostream(3)			User Contributed Perl Documentation		      DBD::Gofer::Transport::corostream(3)

NAME

       DBD::Gofer::Transport::corostream - Async DBD::Gofer stream transport using Coro and AnyEvent

SYNOPSIS

	  DBI_AUTOPROXY="dbi:Gofer:transport=corostream" perl some-perl-script-using-dbi.pl

       or

	  $dsn = ...; # the DSN for the driver and database you want to use
	  $dbh = DBI->connect("dbi:Gofer:transport=corostream;dsn=$dsn", ...);

DESCRIPTION

       The BIG WIN from using Coro is that it enables the use of existing DBI frameworks like DBIx::Class.

KNOWN ISSUES AND LIMITATIONS

	 - Uses Coro::Select so alters CORE::select globally
	   Parent class probably needs refactoring to enable a more encapsulated approach.

	 - Doesn't prevent multiple concurrent requests
	   Probably just needs a per-connection semaphore

	 - Coro has many caveats. Caveat emptor.

STATUS

       THIS IS CURRENTLY JUST A PROOF-OF-CONCEPT IMPLEMENTATION FOR EXPERIMENTATION.

       Please note that I have no plans to develop this code further myself.  I'd very much welcome contributions. Interested? Let me know!

AUTHOR

       Tim Bunce, <http://www.tim.bunce.name>

LICENCE AND COPYRIGHT

       Copyright (c) 2010, Tim Bunce, Ireland. All rights reserved.

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

SEE ALSO

       DBD::Gofer::Transport::stream

       DBD::Gofer

APPENDIX

       Example code:

	   #!perl

	   use strict;
	   use warnings;
	   use Time::HiRes qw(time);

	   BEGIN { $ENV{PERL_ANYEVENT_STRICT} = 1; $ENV{PERL_ANYEVENT_VERBOSE} = 1; }

	   use AnyEvent;

	   BEGIN { $ENV{DBI_TRACE} = 0; $ENV{DBI_GOFER_TRACE} = 0; $ENV{DBD_GOFER_TRACE} = 0; };

	   use DBI;

	   $ENV{DBI_AUTOPROXY} = 'dbi:Gofer:transport=corostream';

	   my $ticker = AnyEvent->timer( after => 0, interval => 0.1, cb => sub {
	       warn sprintf "-tick- %.2f
", time
	   } );

	   warn "connecting...
";
	   my $dbh = DBI->connect("dbi:NullP:");
	   warn "...connected
";

	   for (1..3) {
	       warn "entering DBI...
";
	       $dbh->do("sleep 0.3"); # pseudo-sql understood by the DBD::NullP driver
	       warn "...returned
";
	   }

	   warn "done.";

       Example output:

	   $ perl corogofer.pl
	   connecting...
	   -tick- 1293631437.14
	   -tick- 1293631437.14
	   ...connected
	   entering DBI...
	   -tick- 1293631437.25
	   -tick- 1293631437.35
	   -tick- 1293631437.45
	   -tick- 1293631437.55
	   ...returned
	   entering DBI...
	   -tick- 1293631437.66
	   -tick- 1293631437.76
	   -tick- 1293631437.86
	   ...returned
	   entering DBI...
	   -tick- 1293631437.96
	   -tick- 1293631438.06
	   -tick- 1293631438.16
	   ...returned
	   done. at corogofer.pl line 39.

       You can see that the timer callback is firing while the code 'waits' inside the do() method for the response from the database. Normally
       that would block.

perl v5.18.2							    2013-04-04				      DBD::Gofer::Transport::corostream(3)