Re: While Loops

[Anonymous Monk]

I would like to read the 1st 100 records from the text file, print them, and read the next 100 and print them, etc until I run out of record in the text file

[kennethk]

With the improved spec, you'd want something more like:

#!/usr/bin/perl -w 
use strict;

my @data=();
my $file='c:\text.txt';

open my $fh,"<", $file or die "$file: $!";

while (my $line = <$fh>){
      push @data, $line;
      if (@data == 100) {
            print @data;
            @data = ();
      }
}

print @data;

[blue_cowdawg]

#!/usr/bin/perl -w 
use strict;

my @data=();
my $file='c:\text.txt';
my $count=0;
open FILE,"< $file" or die "$file: $!";

while (my $line =<FILE> ){
      chomp $line;
      push @data,[split /\t/,$line];
      $count++;
      next if $count < 99; 
      while ($#data >= 0 ) {
          printf "%s\n",join(",",shift @data);
      } 
      $count = 0;
}

So.. how much more of your homework do you need me to do?

[tbone654]

we're really guessing at what you are trying to do, so in that spirit maybe here's a real life example that has enough stuff in it to be useful on a few fronts...




test file
#ls -la > test.txt ... abreviated

-rw-r--r--  1 OQ91   Domain Users   273532 Sep 25 15:29 spy.csv.bak
-rw-r--r--  1 OQ91   Domain Users    14704 Jan  8 12:08 spy.sdf
-rw-r--r--  1 OQ91   Domain Users     4329 Oct 17 10:28 spy.sdf.bak
-rwxr-xr-x  1 OQ91   Domain Users  1196465 Sep 26 03:36 spywork.ods
-rw-r--r--  1 OQ91   Domain Users   312739 Jan  8 09:40 spyx.csv
-rwxrwxr-x  1 OQ91   Domain Users     4875 Dec 26 22:05 stone.pl
-rwxr-xr-x  1 OQ91   Domain Users     2396 Oct 25 09:57 stone.pl.121025
-rwxr-xr-x  1 OQ91   Domain Users     3375 Oct 29 10:27 stone.pl.121026
-rwxr-xr-x  1 OQ91   Domain Users     3811 Oct 29 07:52 stone.pl.121029
-rwxr-xr-x  1 OQ91   Domain Users     3809 Nov  8 11:06 stone.pl.121108
-rwxr-xr-x  1 OQ91   Domain Users 77687808 Sep 26 03:46 Taylor_Book_08.xls
-rw-r--r--  1 OQ91   Domain Users     9095 Dec 26 22:14 test15.pl
-rw-r--r--  1 OQ91   Domain Users     4350 Nov  7 01:07 test15.pl.121107
-rw-r--r--  1 OQ91   Domain Users     4424 Nov  7 11:57 test15.pl.121107a
-rw-r--r--  1 OQ91   Domain Users     8630 Nov  7 13:57 test15.pl.121107b
-rw-r--r--  1 OQ91   Domain Users     9039 Nov  8 08:59 test15.pl.121108
-rw-r--r--  1 OQ91   Domain Users     9156 Dec 26 22:10 test15.pl.121226
-rw-r--r--  1 OQ91   Domain Users    46987 Dec  4 13:25 zzz.out

$ cat test.txt | perl -l -n -e 'BEGIN {$x="OQ91";$linecount=0;$sum=0;} if((split)[2]==$x){$linecount++ ;$sum += (split)[5]; printf "%s\t %s\t\t %s\n",(split)[2],(split)[5],(split)[9]} ; END {printf "linecount: %d  Sum: %d",$linecount,$sum}'

Here's some output... abreviated

OQ91     312739          spyx.csv
OQ91     4875            stone.pl
OQ91     2396            stone.pl.121025
OQ91     3375            stone.pl.121026
OQ91     3811            stone.pl.121029
OQ91     3809            stone.pl.121108
OQ91     77687808                Taylor_Book_08.xls
OQ91     9095            test15.pl
OQ91     4350            test15.pl.121107
OQ91     4424            test15.pl.121107a
OQ91     8630            test15.pl.121107b
OQ91     9039            test15.pl.121108
OQ91     9156            test15.pl.121226
OQ91     46987           zzz.out
linecount: 61  Sum: 88200728

sums the 5th column if the tests are true, counts the lines... prints the 2nd, 5th and 9th columns, AND it's a one liner...