perl中的while处理文件
# cat w.pl#!/usr/bin/perl
$filename='/etc/passwd';
open(FILE,$filename)or die;
while($line = ){
($username,$secret,$uid,$gid)=split(":",$line);
print "$username,$secret,$uid,$gid\n";
}
close(FILE);
$filen='/etc/group';
open(GROUP,$filen)or die;
while(){
($groupname)=split(":");
print "$groupname\n";
}
close(GROUP);
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