Training, Open Source computer languages
PerlPHPPythonMySQLApache / TomcatTclRubyJavaC and C++LinuxCSS 
Search for:
Home Accessibility Courses Diary The Mouth Forum Resources Site Map About Us Contact
 
For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))
Read all but the first line from a file

Posted by hemant (hemant), 30 November 2004
Hello,

    I want to read a file in PERL. I want to skip the first line. All the lines except the first line should be written to another file.

    Can anybody suggest me how to do this?

Thanks and regards,
Hemant

Posted by Custard (Custard), 30 November 2004
How about something like..

use IO::File;
my $fdin=   new IO::File( '<InFile.txt' );
my $fdout= new IO::File( '>OutFile.txt' );

my $firstLine = <$fdin>;

while( <$fdin> ) {
   print $fdout $_;
}

Untested, but looks promising....

Let us know how you get on,

HTH,

Posted by dcorking (David Corking), 30 November 2004
Tut tut - coding without testing  

In my quest to gain a little Perl literacy I pasted this in and ran it in v5.8.0 with four test cases that I could think of  (no lines, only one line, one line with no terminator, several lines)

They all worked so I have nothing to debug

(provided that the spec is to produce no error messages in any of those cases, and quietly overwrite existing files, but that wasn't hemant's question, was it?)

David


Posted by Custard (Custard), 30 November 2004
on 11/30/04 at 19:00:36, David Corking wrote:
Tut tut - coding without testing  

<snip>

(provided that the spec is to produce no error messages in any of those cases, and quietly overwrite existing files, but that wasn't hemant's question, was it?)

David


You raise a good point, m'lud.  Of course there should be tests for definedness of the opened filehandles.
Fair cop.



B



This page is a thread posted to the opentalk forum at www.opentalk.org.uk and archived here for reference. To jump to the archive index please follow this link.

You can Add a comment or ranking to this page

© WELL HOUSE CONSULTANTS LTD., 2024: Well House Manor • 48 Spa Road • Melksham, Wiltshire • United Kingdom • SN12 7NY
PH: 01144 1225 708225 • FAX: 01144 1225 793803 • EMAIL: info@wellho.net • WEB: http://www.wellho.net • SKYPE: wellho