Perl map doubt

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Understanding an example of perl map() function

Hello, I have many folders under which there is always a file with the same name, which contains the data I need to process later. A perl oneliner was borrowed perl -e 'print "gene_id\t", join("\t", map {/(.*)\//; $1} @ARGV),"\n";' *_test.trim/level.csvto make a header so that each column...

2. Shell Programming and Scripting

Perl combine multiple map statements

I have a file like file. file.TODAY.THISYEAR file.TODAY.LASTYEARI want to substitute the words in caps with their actual values so that output should look like file.140805 file.140805.2014 file.140805.2013For this I am reading the file line bye line in an array and using multiple map...

3. Shell Programming and Scripting

Looping in Perl based on defined keys in Map

Hello All, I am writing the below script where it will connect to database and returns the results. #!/sw/gcm/perl510/bin/perl use SybaseC; &openConnection; &loadvalues; sub openConnection { $dbproc = new SybaseC(SYDB}, $ENV{DBDFLTUSR}, $ENV{DBDFLTPWD}); if...

4. Shell Programming and Scripting

perl doubt

Hi, Please help me to understand the following code: perl -lne 'print if "$_ " =~ /(5 (?:\d+ ){5})\1/' What the regular expression "?:" does? Also, whether the expression "\1" is the same as in sed (i.e) printing the elements inside pair of parentheses?

5. Shell Programming and Scripting

Trivial perl doubt about FILE

Hi, In the following perl code: #!/usr/bin/perl -w if (open(FILE, "< in_file")) { while (<FILE>) { chomp($_); if ($_ =~ /patt$/) { my $f = (split(" ", $_)); print "$f\n"; } } close FILE; } Why changing the "FILE" as...

6. Shell Programming and Scripting

How to map the values of an array in perl?

Hi, I have 2 arrays: @names=qw(amith veena chaitra); @files=qw(file.txt file1.txt file3.txt); There is one to one relationship between names and files. There needs to be mapping created between names and files. The output should be like this: amith --> file.txt veena --->...

7. Shell Programming and Scripting

Grep and map in perl

Hi guys, I'm trying to learn grep and map and having a little problem. Let's say I have a file which contains: Apple: abcdcabdadddbac I want to replace any combinations of three of abcd, thus when I do this: print grep {s/{3}/X/g} <F>; # will do the subtitution fine, output XXXX ...

8. Shell Programming and Scripting

Doubt in Perl Variable declaration

Anyone please say what is the difference between $var and ${var} in perl Sometimes $var used and sometimes ${var} used in same program. Thanks in Advance, Prabhu ---------- Post updated at 09:34 AM ---------- Previous update was at 05:59 AM ---------- Any one please clarify

9. Shell Programming and Scripting

Perl script doubt?

Dear friends, I have two files. In first file first column ($1), i have numbers. The second file containes, the same number in the fourth column($4). I need a output file, matching the first file column 1 with second file column 4. The main thing is the output file lines will be sorted...

10. Shell Programming and Scripting

perl doubt plz explain....

hi all i wrote a shell script which uses perl script my code is : >cat filename | while read i >do >perl -e 'require "/home/scripts/abc.pl" ; abc("$i")' >done perl script used will simply check syntax of Cobol programs but it didn't work for me so i asked my colleague he suggested...

LEARN ABOUT OSX

apache::testtrace

Apache::TestTrace(3)					User Contributed Perl Documentation				      Apache::TestTrace(3)

NAME

       Apache::TestTrace - Helper output generation functions

SYNOPSIS

	   use Apache::TestTrace;

	   debug "foo bar";

	   info_sub "missed it";

	   error_mark "something is wrong";

	   # test sub that exercises all the tracing functions
	   sub test {
	       print $Apache::TestTrace::LogFH
		     "TraceLevel: $Apache::TestTrace::Level
";
	       $_->($_,[1..3],$_) for qw(emerg alert crit error
					 warning notice info debug todo);
	       print $Apache::TestTrace::LogFH "

"
	   };

	   # demo the trace subs using default setting
	   test();

	   {
	       # override the default trace level with 'crit'
	       local $Apache::TestTrace::Level = 'crit';
	       # now only 'crit' and higher levels will do tracing lower level
	       test();
	   }

	   {
	       # set the trace level to 'debug'
	       local $Apache::TestTrace::Level = 'debug';
	       # now only 'debug' and higher levels will do tracing lower level
	       test();
	   }

	   {
	       open OUT, ">/tmp/foo" or die $!;
	       # override the default Log filehandle
	       local $Apache::TestTrace::LogFH = *OUT;
	       # now the traces will go into a new filehandle
	       test();
	       close OUT;
	   }

	   # override tracing level via -trace opt
	   % t/TEST -trace=debug

	   # override tracing level via env var
	   % env APACHE_TEST_TRACE_LEVEL=debug t/TEST

DESCRIPTION

       This module exports a number of functions that make it easier generating various diagnostics messages in your programs in a consistent way
       and saves some keystrokes as it handles the new lines and sends the messages to STDERR for you.

       This module provides the same trace methods as syslog(3)'s log levels. Listed from low level to high level: emerg(), alert(), crit(),
       error(), warning(), notice(), info(), debug(). The only different function is warning(), since warn is already taken by Perl.

       The module provides another trace function called todo() which is useful for todo items. It has the same level as debug (the highest).

       There are two more variants of each of these functions. If the _mark suffix is appended (e.g., error_mark) the trace will start with the
       filename and the line number the function was called from. If the _sub suffix is appended (e.g., error_info) the trace will start with the
       name of the subroutine the function was called from.

       If you have "Term::ANSIColor" installed the diagnostic messages will be colorized, otherwise a special for each function prefix will be
       used.

       If "Data::Dumper" is installed and you pass a reference to a variable to any of these functions, the variable will be dumped with
       "Data::Dumper::Dumper()".

       Functions whose level is above the level set in $Apache::TestTrace::Level become NOPs. For example if the level is set to alert, only
       alert() and emerg() functions will generate the output. The default setting of this variable is warning. Other valid values are: emerg,
       alert, crit, error, warning, notice, info, debug.

       Another way to affect the trace level is to set $ENV{APACHE_TEST_TRACE_LEVEL}, which takes effect if $Apache::TestTrace::Level is not set.
       So an explicit setting of $Apache::TestTrace::Level always takes precedence.

       By default all the output generated by these functions goes to STDERR. You can override the default filehandler by overriding
       $Apache::TestTrace::LogFH with a new filehandler.

       When you override this package's global variables, think about localizing your local settings, so it won't affect other modules using this
       module in the same run.

TODO

	o provide an option to disable the coloring altogether via some flag
	  or import()

AUTHOR

       Stas Bekman with contributions from Doug MacEachern

perl v5.16.2							    2011-02-07						      Apache::TestTrace(3)

Shell Programming and Scripting