Shell Programming and Scripting

LGS-HF2-2$ sed -i '1,2d' last_half_hour.txt 
sed: illegal option -- i

#!/bin/sh
sed -n '/[0-9][0-9]\/[0-9][0-9]\/[0-9][0-9][0-9][0-9]/p' time.txt | sed  -e 's/ /./' -e 's/\//./g' > time_stamps.txt
last_time_stamp=`sed -n '$'p time_stamps.txt`
sed  '$'d time_stamps.txt > temp0.txt
mv temp0.txt time_stamps.txt
last_time_stamp1=`sed -n '$'p time_stamps.txt`
sed -n '/'$last_time_stamp1'/,/'$last_time_stamp'/'p time.txt > last_half_hour.txt
sed  '1'd last_half_hour.txt > temp.txt
sed  '$'d temp.txt > temp1.txt
mv  temp1.txt last_half_hour.txt

#!/bin/sh
sed -n '/[0-9][0-9]\/[0-9][0-9]\/[0-9][0-9][0-9][0-9]/p' time.txt | sed  -e 's/ /./' -e 's/\//./g' > time_stamps.txt
last_time_stamp=`sed -n '$'p time_stamps.txt`
sed  '$'d time_stamps.txt > temp0.txt
mv temp0.txt time_stamps.txt
last_time_stamp1=`sed -n '$'p time_stamps.txt`
sed -n '/'$last_time_stamp1'/,/'$last_time_stamp'/'p time.txt > last_half_hour.txt
sed  '1'd last_half_hour.txt > temp.txt
sed  '$'d temp.txt > temp1.txt
mv  temp1.txt last_half_hour.txt

my ($pre,$cur);
while(<DATA>){
  if (/([0-9]{2})\/([0-9]{2})\/([0-9]{4})\s+([0-9]{2}):([0-9]{2})/){
    $temp = $3."_".$2."_".$1."_".$4."_".$5;
    if($.==1){
       $cur = $temp;
       $pre = $temp;
    }
    else{
      $cur = $temp;
      my $tmp = ${pre}."-".$cur.".leo";
      open FH,">$tmp";
      print FH @{$hash{$pre}};
      close FH;
      @{$hash{$temp}}=(@{$hash{$pre}});
      $pre = $temp;
    }
    next;
  }
  else{
    push @{$hash{$temp}},$_;
  }
}
my $temp=${pre}."_now.leo";
open FH,">$temp";
print FH @{$hash{$pre}};
close FH;
__DATA__
29/09/2010 00:30
line 1
line 2
29/09/2010 01:00
line 3
line 4
29/09/2010 01:30
line 5
line 6
29/09/2010 02:30
line 7
line 8