I got a file which has a header and some data lines 
    Usr1369***12556
06-01-0101:00    1169 <snipped off>
06-01-0101:00    2396 <snipped off>
06-01-0103:12    1169 <snipped off>
06-01-0103:12    2569 <snipped off>
06-01-0301:00    1169 <snipped off>
06-01-0301:00    2396 <snipped off>

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What needs to be done is to split the file into multiple files based upon the first field such as 06-01-0101:00 So the output file will be 
    Usr1369***12556
06-01-0101:00    1169 <snipped off>
06-01-0101:00    2396 <snipped off>

    Usr1369***12556
06-01-0103:12    1169 <snipped off>
06-01-0103:12    2569 <snipped off>

    Usr1369***12556
06-01-0301:00    1169 <snipped off>
06-01-0301:00    2396 <snipped off>

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I can get the header and one line by using 
my @filedata = <IFILE_HANDLER>;
my $head = shift(@filedata);
my $line

foreach $line(@filedata);

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Then I get the outputfile handler and do 
print (OFILE_HANDLER "$head");
print (OFILE_HANDLER  "$line");
close (OFILE_HANDLER);

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I haven't the faintest idea of how to group it such that I get one file for each combination of ^\d{2}-\d{2}-\d{4}:\d{2} Would appreciate any help you guys could give.

In reply to Split file based on field by calv1n

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