perl - 创建 gzip 文件的最佳方式

问题描述

我需要改变我的例行程序并将最终的输出文件进行 gzip 压缩.我试图找出对 perl 子例程中调用的已处理文件进行 gzip 压缩的最佳方法是什么.

I need to alter my routine and have the final outfile be gzipped. I'm trying to figure out what is the best way to gzip a processed file called within a perl subroutine.

例如，我有一个创建文件 (extract_data) 的子例程.这是主循环和子程序:

For example, I have a sub routine that creates the file (extract_data). Here's the main loop and sub routine:

foreach my $tblist (@tblist)
{
   chomp $tblist;
   extract_data($dbh, $tblist);
};
$dbh->disconnect;

sub extract_data
{
     my($dbh, $tblist) = @_;
     my $final_file = "/home/proc/$node-$tblist.dat";
     open (my $out_fh, '>', $final_file) or die "cannot create $final_file: $!";
     my $sth = $dbh->prepare("...");
     $sth->execute();
     while (my($uid, $hostnm,$col1,$col2,$col3,$upd,$col5) = $sth->fetchrow_array() ) {
       print $out_fh "__my_key__^A$uid^Ehost^A$hostnm^Ecol1^A$col1^Ecol2^A$col2^Ecol3^A$col3^Ecol4^A$upd^Ecol5^A$col5^D";
     }
     $sth->finish;
     close $out_fh or die "Failed to close file: $!";
};

我是在主文件中还是在子文件中执行 gzip?这样做的最佳方法是什么?那么我的新文件将是 $final_file =/home/proc/$node-$tblist.dat.gz

Do I do the gzip within the main or with the sub? What is the best way to do so?Then my new file would be $final_file =/home/proc/$node-$tblist.dat.gz

谢谢.

推荐答案

我知道有一些模块可以在不使用外部程序的情况下做到这一点，但是因为我比我更了解如何使用 gzip了解如何使用这些模块，我只需打开一个流程到 gzip 并称它为一天.

I know there are modules to do this without using external programs, but since I understand how to use gzip a lot better than I understand how to use those modules, I just open a process to gzip and call it a day.

open (my $gzip_fh, "| /bin/gzip -c > $final_file.gz") or die "error starting gzip $!";
...
while (... = $sth->fetchrow_array()) {
    print $gzip_fh "__my_key__^A$uid^Ehost^A$hostname..."; # uncompressed data
}
...
close $gzip_fh;

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