I've been tooling about with Perl to make a few string replacements in some files; and seem to have run into a bit of a squeeze
Beginning with a simple text file, test.txt, we have the following content to be worked:
Quote:
Mary had a little lamb.
Now, not wanting to have anyone feel left out, I decided that it would be nice if Joe could have his time in the sun as well. So, I invoked Perl from the commandline with the following generally-familiar "one liner":
Code:
perl -p -i -e 's/Mary/Joe/' test.txt
Works like a charm: Quick and easy; and Joe's happy, too
Now, being a curious sort of fellow, I decided to "simply" create a script which'd do the same thing as the above command; leading to the following "best effort" with my limited knowledge of the topic:
Code:
#!/usr/bin/perl -w
use strict;
use warnings;
my $file = 'test.txt';
open my $content, ">", $file or die("Could not open file. $!");
$content =~ s/Mary/Joe/g;
print $content $file;
close $content;
Input text: "Mary had a little lamb."
Output: "test.txt"
I know there's a simple twist I'm missing here; but can't get a grip on it for the life of me
Now, if I want to be really square, I can simply do a bash script with the single line,
Code:
perl -p -i -e 's/Mary/Joe/' test.txt
...and, of course, all works a treat without a fuss.
Incidentally, I will need to do a find/replace operation with whatever snippet finally emerges on several files at a time. I can get this to work as:
Hi guys, I hope you can help me with my problem.
I have a text file that contains lines like this:
78 ANGELO -809.05
79 ANGELO2 -5,000.06
I need to find all occurences of amounts that are negative and replace them with x's
78 ANGELO xxxxxxx
79... (4 Replies)
I want to replace a string within a file using perl.
We have a line that gets commented out, and I want to replace that line now matter how it was commented out.
for example, I'd want to replace
###ES=PR1A with ES=PR1A
or
##LJW(9/16/26)ES=PR1A with ES=PR1A
I tried: perl... (4 Replies)
I want to append a decimal number to a string. But I want to restrict the number to only 2 decimal points
for e.g:
my $output = "\n The number is = ";
my $number = 2.3333333;
$output = $output . $number;
But I want the $output as: "The number is = 2.33"; and not 2.3333333
(I do not... (1 Reply)
I have one string
string1=user/password:IP_ADDR:Directory
I need to replace string1 value like store into string2
string2=user password:IP_ADDR:Directory
i.e replace "/" character by '<space>' character
But i wouldn't use any file in the meantime.
Please help me......................... (6 Replies)
Hi All,
I have below file which has data in below format.
#$ | AB_100
| AB_300
()| AB_4
@*(% | AB-789
i want o/p as below format.
| AB_100
| AB_300
| AB_4
| AB-789
So here there is no standard format.
How we can achieve the same in unix ?
Regards, (3 Replies)
Hey everybody. I've got a simple problem but am unsure how to resolve it. I am using a script to edit multiple files at once. Inside the script I am using an sed command to make the changes. My problem is that I can only get it to work for stings that contain a word or words. How can I modify it to... (1 Reply)
Dear Friends,
I want to replace following line with given line.
It should grep/search following string in a file (input.txt)
M/M SRNO: 000M/6200-0362498 COSMETIC PRO MALE FEMALE
Once found it should replace it to following string.
T_DLHNNO: 000M/6200-0362498 ... (7 Replies)
Hallo everybody,
I have a following problem - I'm doing a map funciont to fill in a HTML table and I want to use some radiobutton groups. Unfortunatelly, they are grouped by names, so I have to add some "counter" that will divide one row from another, and I'm using CGI.pm for generating the... (3 Replies)
Hi,
I have a text file where all records come in one line (single line file), each record starts with 'BUCH' and ends with '@&' and if data is not there we get space instead. between '@&' and next record there might be some spaces, now I want to remove those spaces between '@&' and 'BUCH'.
... (4 Replies)
Greetings!
Here's what I believe is a "simple one" for the community tonight ;)
What I'm trying to do is assign a "true/false" value to a variable depending upon whether a named process (some-process) exists; and then test for this value in the succeeding logic. I banged my head against the... (2 Replies)
Discussion started by: LinQ
2 Replies
LEARN ABOUT DEBIAN
test::regression
Test::Regression(3pm) User Contributed Perl Documentation Test::Regression(3pm)NAME
Test::Regression - Test library that can be run in two modes; one to generate outputs and a second to compare against them
VERSION
Version 0.05
SYNOPSIS
use Test::Regression;
ok_regression(sub {return "hello world"}, "t/out/hello_world.txt");
DESCRIPTION
Using the various Test:: modules you can compare the output of a function against what you expect. However if the output is complex and
changes from version to version, maintenance of the expected output could be costly. This module allows one to use the test code to
generate the expected output, so that if the differences with model output are expected, one can easily refresh the model output.
EXPORT
ok_regression
FUNCTIONS
ok_regression
This function requires two arguments: a CODE ref and a file path. The CODE ref is expected to return a SCALAR string which can be compared
against previous runs. If the TEST_REGRESSION_GEN is set to a true value, then the CODE ref is run and the output written to the file.
Otherwise the output of the file is compared against the contents of the file. There is a third optional argument which is the test name.
ENVIRONMENT VARIABLES
TEST_REGRESSION_GEN
If the TEST_REGRESSION_GEN environment file is unset or false in a perl sense, then the named output files must exist and be readable and
the test will run normally comparing the outputs of the CODE refs against the contents of those files. If the environment variable is true
in a perl sense, then model output files will be overwritten with the output of the CODE ref.
AUTHOR
Nicholas Bamber, "<nicholas at periapt.co.uk>"
BUGS
Please report any bugs or feature requests to "bug-test-regression at rt.cpan.org", or through the web interface at
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Regression>. I will be notified, and then you'll automatically be notified of
progress on your bug as I make changes.
testing of STDERR
The testing of stderr from this module is not as thorough as I would like. Test::Builder::Tester allows turning off of stderr checking but
not matching by regular expression. Handcrafted efforts currently fall foul of Test::Harness. Still it is I believe adequately tested in
terms of coverage.
SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Test::Regression
You can also look for information at:
o RT: CPAN's request tracker
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=Test-Regression>
o AnnoCPAN: Annotated CPAN documentation
<http://annocpan.org/dist/Test-Regression>
o CPAN Ratings
<http://cpanratings.perl.org/d/Test-Regression>
o Search CPAN
<http://search.cpan.org/dist/Test-Regression/>
ACKNOWLEDGEMENTS
Some documentation improvements have been suggested by toolic (http://perlmonks.org/?node_id=622051).
Thanks to Filip GraliXski for pointing out I need to test against output of zero length and providing a patch.
COPYRIGHT &; LICENSE
Copyright 2009-10 Nicholas Bamber.
This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as
published by the Free Software Foundation; or the Artistic License.
See http://dev.perl.org/licenses/ for more information.
perl v5.10.1 2010-08-29 Test::Regression(3pm)
05-17-2014
