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 DEBIAN

perl::critic::policy::builtinfunctions::requireblockgrep

Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrepUser)Contributed Perl DocumenPerl::Critic::Policy::BuiltinFunctions::RequireBlockGrep(3pm)

NAME

       Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrep - Write "grep { $_ =~ /$pattern/ } @list" instead of "grep /$pattern/, @list".

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       The expression forms of "grep" and "map" are awkward and hard to read.  Use the block forms instead.

	   @matches = grep  /pattern/,	  @list;	#not ok
	   @matches = grep { /pattern/ }  @list;	#ok

	   @mapped = map  transform($_),    @list;	#not ok
	   @mapped = map { transform($_) }  @list;	#ok

CONFIGURATION

       This Policy is not configurable except for the standard options.

SEE ALSO

       Perl::Critic::Policy::BuiltinFunctions::ProhibitStringyEval

       Perl::Critic::Policy::BuiltinFunctions::RequireBlockMap

AUTHOR

       Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

COPYRIGHT

       Copyright (c) 2005-2011 Imaginative Software Systems.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.  The full text of this license
       can be found in the LICENSE file included with this module.

perl v5.14.2							    2012-06-07	     Perl::Critic::Policy::BuiltinFunctions::RequireBlockGrep(3pm)

Shell Programming and Scripting