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Full Discussion: Replacing contents in a file from multiple programmes
Top Forums Shell Programming and Scripting Replacing contents in a file from multiple programmes Post 302231595 by tosatesh on Tuesday 2nd of September 2008 07:04:02 PM
Old 09-02-2008
Hi All,
I have a query on Perl. I have a text file which has 3 lines, i want to only replace the first line with my replaced text and keep the rest of the text. FOr eg

Before change -->
echo:aending
echopending
echo:cending

After change --->
echo:a:done
echopending
echo:cending

Brief: Here i am continuously trying to modify the text file though this perl programme from multiple machines i.e this perl prog will run on multiple machines trying to modify\change a single text.

Snippet of my code.(not working yet. It appends to the text file instead of replacing it). Can you please guide me to this.
============================================
open(MYFILE, "+< $myfile") || die;
flock(MYFILE, 2);

#my $myfile="c:\\ssk\\help.txt";
#open INPUT, "<$myfile";
undef $/;
my $content = <MYFILE>;
my $inprogress = "inprogress";
my $done = "done";
$content =~ m/(\w*)\w*)\w*)/;

if ($3 eq "pending")
{

$content=~ s/pending/inprogress/;
my $contentbkup = $content;
$content =~ s/(.*)//g;
print MYFILE "$1";
print MYFILE "$contentbkup";
$contentbkup =~ s/(.*).*).*)/(.*).*):$done/;
}

seek(MYFILE, 0, 0);
close MYFILE;
$/ = "\n";
 

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LEARN ABOUT DEBIAN

tv_cat

TV_CAT(1p)						User Contributed Perl Documentation						TV_CAT(1p)

NAME

       tv_cat - Concatenate XMLTV listings files.

SYNOPSIS

       tv_cat [--help] [--output FILE] [FILE...]

DESCRIPTION

       Read one or more XMLTV files and write a file to standard ouput whose programmes are the concatenation of the programmes in the input
       files, and whose channels are the union of the channels in the input files.

       --output FILE write to FILE rather than standard output

       The treatment of programmes and channels is slightly different because for programmes, the ordering is important (typically programmes are
       processed or displayed in the same order as they appear in the input) whereas channels are just a set indexed by channel id.  There is a
       warning if channel details clash for the same id.

       One more wrinkle is the credits (source, generator and so on), they are taken from one of the files and then there's a warning if the other
       files differ.  If two input files have different character encodings, then it is not meaningful to combine their data (without recoding or
       other processing) and tv_cat die with an error message.

       This tool is rather useless, but it makes a good testbed for the XMLTV module.

SEE ALSO

       xmltv(5).

AUTHOR

       Ed Avis, ed@membled.com

perl v5.14.2							    2003-10-25								TV_CAT(1p)
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