03-21-2013
Why is it normally not a good idea to use shell vars in awk? Is it because of the single quotes hiding the variable? Or some other reason?
7 More Discussions You Might Find Interesting
1. Programming
In a declaration, I have:
const char comment_begin = "<!--";
const char comment_end = "-->";
const int comment_begin_len = strlen(comment_begin);
const int comment_end_len = strlen(comment_end);
When I compile, I get the warnings:
emhttpc.c:64: warning: initializer element is not... (10 Replies)
Discussion started by: cleopard
10 Replies
2. Shell Programming and Scripting
Database.txt
John:30:40
echo -n "New Title Please :"
read NewTitle
awk -F":" 'OFS = ":"{ $1 = "'$NewTitle'" ; print $0 } ' Database.txt> Database2.txt
mv Database2.txt Database.txt
what this does, is that when i input something into $NewTitle, it will update $1 which is "John" into... (3 Replies)
Discussion started by: gregarion
3 Replies
3. Shell Programming and Scripting
Hallo
I have maybe a little bit advanced request....
I need to choose one random part betwen %....
so i have this..
%
text1 text1 text1
text1 text1 text1
text1 text1 text1
%
text2 text2
text2 text2 text2
%
text3 text3 text3
tetx3
%
this choose text between %
awk ' /%/... (8 Replies)
Discussion started by: sandwich
8 Replies
4. Solaris
I get a file which has all its content in a single row.
The file contains xml data containing 3000 records, but all in a single row, making it difficult for Unix to Process the file.
I decided to insert a new line character at all occurrences of a particular string in this file (say replacing... (4 Replies)
Discussion started by: ducati
4 Replies
5. Shell Programming and Scripting
Hi. I define my variables as:
month=jul
DD=17
YEAR=2012
transmission_file_name_only=test_$month$DD$YEAR_partial.dat
However when I run my script the variable 'transmission_file_name_only' resolves to:
File "/downloads/test_jul17.dat" not found.
How can I append this '_partial'... (3 Replies)
Discussion started by: buechler66
3 Replies
6. Programming
I wonder string constant exists permanently or temporary.
For example,
printf("hello, world");
the function printf access to it is through a pointer. Does it mean storage is allocated for the string constant to exist permanently in memory? :confused: (4 Replies)
Discussion started by: kris26
4 Replies
7. Shell Programming and Scripting
My file (the output of an experiment) starts off looking like this,
_____________________________________________________________
Subjects incorporated to date: 001
Data file started on machine PKSHS260-05CP
**********************************************************************
Subject 1,... (9 Replies)
Discussion started by: samonl
9 Replies
LEARN ABOUT DEBIAN
perl::critic::policy::valuesandexpressions::requireinterpolation
Perl::Critic::Policy::ValuesAndExpressions::RequireInterUsertContrPerl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars(3pm)
NAME
Perl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars - Warns that you might have used single quotes when you really
wanted double-quotes.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
This policy warns you if you use single-quotes or "q//" with a string that has unescaped metacharacters that may need interpolation. Its
hard to know for sure if a string really should be interpolated without looking into the symbol table. This policy just makes an educated
guess by looking for metacharacters and sigils which usually indicate that the string should be interpolated.
Exceptions
o Variable names to "use vars":
use vars '$x'; # ok
use vars ('$y', '$z'); # ok
use vars qw< $a $b >; # ok
o Things that look like e-mail addresses:
print 'john@foo.com'; # ok
$address = 'suzy.bar@baz.net'; # ok
CONFIGURATION
The "rcs_keywords" option allows you to stop this policy from complaining about things that look like RCS variables, for example, in
deriving values for $VERSION variables.
For example, if you've got code like
our ($VERSION) = (q<$Revision: 4106 $> =~ m/(d+)/mx);
You can specify
[ValuesAndExpressions::RequireInterpolationOfMetachars]
rcs_keywords = Revision
in your .perlcriticrc to provide an exemption.
NOTES
Perl's own "warnings" pragma also warns you about this.
SEE ALSO
Perl::Critic::Policy::ValuesAndExpressions::ProhibitInterpolationOfLiterals
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 Perl::Critic::Policy::ValuesAndExpressions::RequireInterpolationOfMetachars(3pm)