小时代5-perl文件读取的几种处理方式小结

1、单行(大文件处理)：

my $oneline = <$FL> 或
while（$line=）
{ }

2、读取全部(小文件处理)：

open (my $in, "path ") or die "open error: $! ";
my @lines = <$in> ;

3、读3行(大文件及特殊处理需要)：

open (my $in, "path ") or die "open error: $! ";
my @lines;
push (@lines, scalar <$in> ) for (1..3);

4、每次按条件读入三行，并且按照条件输出两行。

while () {
if(index ($_, "=") > -1){
my $position=tell(TEST);
my $keyword_line=$_;
my $line_1=;
my $line_2=;
# @a=split//,$keyword_line;  比较它们的元素是否相等，一直没成功
# @b=split//,$line_1;         利用if ($a[0]eq $a[0])来判断
# @c=split//,$line_2;
if (($line_2)&&(index($line_2, "=")>-1)){ # 或者if ($line_2=~/=/)
print OUTFILE "$_$line_1";
}
if (!($line_2)) { print OUTFILE "$_$line_1"; last; }
seek(TEST, $position, 0);
}
}

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