Help with creating a text file in perl with file creation date. Post: 302517318

Sponsored Content

Top Forums Shell Programming and Scripting Help with creating a text file in perl with file creation date. Post 302517318 by kevintse on Tuesday 26th of April 2011 12:09:45 PM

04-26-2011

Registered User

Quote:

Originally Posted by Corona688

It seems a common misconception that there's a Specific Way��™ to do things in a computer language and you can find all the answers by googling "how do I do X in perl". It really doesn't work that way. You have to break it down into logical steps.

1) Logical step 1. How do I get the time in perl? I guess wildly and try perldoc -f time That returns it in seconds. A start.

2) Logical step 2. How can I convert that into something I can use? Well, the 'time' function documentation suggests the localtime function and perldoc -f localtime suggests the strftime function and the POSIX module and even gives examples. time isn't needed apparently since localtime calls it implicitly unless you give it otherwise. man strftime also tells you what strings strftime needs.

3) Logical step 3. How can I open a string as a filename? The same way you open any other filename. perldoc -f open

So you get

Code:

#!/usr/bin/perl

use POSIX;

my $filename=strftime("filename_%y%M%d.TXT", localtime);
print "filename is $filename\n";
open(FILE, ">$filename") || die("Couldn't open file");

print FILE "hello world\n";

close(FILE);
exit(0);

I knew none of this by heart, I just followed the trail of instructions.

Answer so detailed like this is really great.
There's a Chinese proverb that reads: "授人以鱼, 不如授人以渔", which means "If you give him a fish, he'll only have a single meal, if you teach him to fish, he will feed himself for his whole life.".

Thank you~

kevintse

View Public Profile for kevintse

Find all posts by kevintse

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Changing Creation Date to a Prespecified Date of a File In Unix

Dear Expert, Is there a command to do that in Unix? In such a way that we don't need to actually "write" or modified the content. -- monkfan

2. Shell Programming and Scripting

How to get File creation date.

Hi All, I need to get file creation date. I have to access one file who's name is like... abc.log092308 and the date changes as per current date. And i am accessing this file next day. meance in above case i will access above file on 09-24-2008 Also one problem is that this file...

3. Solaris

gzip a file and append creation date stamp to file

I want to gzip a file and append the creation date to the end of the file. How can I accomplish this task. Basically they are log files which need a creation date stamp appended to make sure they do not overwrite other log files. -jack

4. Shell Programming and Scripting

how to find creation date of file

Hi, I just need to know way of getting date of file when it was created. eg i have a file abc created on 23 aug. Now i need to know date of file i.e. 23 aug. How can i get that data. Thanks Sarbjit

5. Shell Programming and Scripting

finding creation date of a file

Hi, Can anyone tell me a process to find the creation date of a file in a directory. If suppose I have a file in a directory created in 2009 -rw-r--r-- 1 xyz guest 2480 Jul 16 2009 sample.txt The command should return the the file creation date as 16/07/2009 thanks,

6. Shell Programming and Scripting

The scope of the shell/perl script is to read the input text file. Validate the expiry date of each

The scope of the shell/perl script is to read the input text file. Validate the expiry date of each certificate and send the mail to the user. The user takes action to add the new certificate to the storage file and user owns the responsibility to update the input text file with the new certificate...

7. Shell Programming and Scripting

finding the previous day date and creating a file with date

Hi guys, I had a scenario... 1. I had to get the previous days date in yyyymmdd format 2. i had to create a file with Date inthe format yyyymmdd.txt format both are different thanks guys in advance..

8. UNIX for Advanced & Expert Users

Add file creation date as new column

Hi , I have a requirement to append file creation date to each row in a file for all the files in a directory. Please help Thanks, Pavan

9. Shell Programming and Scripting

Script to print file name and its creation date

Hello , I am looking for a script to print file name and its last updated time. FILE CREATION-TIME FILE-NAME 24/10/2017 12:34 TDR-IU-8-2017.10.24.07:40:00-2017.10.24.07:45:00 when we run l command it print the directory and the files with details like permission,...

10. Shell Programming and Scripting

How to print the specific part of the file name with file creation date?

Hello Folks, I have an requirement, where i need to get total count of the file based on creation date with there filename selected pattern. Filename: MobileProtocol.20171228T154200.157115.udr I want to get the count of files created on each day based on a pattern find. find . -type...

LEARN ABOUT OSX

time::epoch

Epoch(3)						User Contributed Perl Documentation						  Epoch(3)

NAME

       Time::Epoch - Convert between Perl epoch and other epochs

SYNOPSIS

	 #!/usr/bin/perl -wl
	 use Time::Epoch;
	 my $perlsec  = 966770660;  # Sun Aug 20 07:24:21 2000 -0400 on Mac OS
	 my $epochsec = perl2epoch($perlsec, 'macos', '-0400');
	 my $perlsec2 = epoch2perl($epochsec, 'macos', '-0400');

	 print $perlsec;
	 print $perlsec2;
	 print $epochsec;
	 # correct time on Unix:
	 print scalar localtime $perlsec;
	 # correct time on Mac OS (-0400):
	 print scalar localtime $epochsec;

DESCRIPTION

       Exports two functions, "perl2epoch" and "epoch2perl".  Currently only goes between Perl (Unix) epoch and Mac OS epoch.  This is in
       preparation for an eventual move of Perl to its own universal epoch, so we can get the system epoch of any platform that differs from
       Perl's.

   Epochs
       o   macos

	   Takes additional optional parameter of time zone differential.  If time zone differential not supplied, we guess by getting the
	   different between "localtime" and "gmtime" with <Time::Local::timelocal>.

BUGS

       o   Hm.	With the above test, "scalar localtime $perlsec" under my Linux box and "scalar localtime $epochsec" under my Mac OS box are off
	   by one second from each other.  Maybe a leap second thing?  Odd.

AUTHOR

       Chris Nandor <pudge@pobox.com>, http://pudge.net/

       Copyright (c) 2000-2003 Chris Nandor.  All rights reserved.  This program is free software; you can redistribute it and/or modify it under
       the terms of the Artistic License, distributed with Perl.

SEE ALSO

       perl(1), perlport(1), Time::Local.

perl v5.16.2							    2003-05-21								  Epoch(3)