使用 Perl 比较文件的内容

在 Perl 中，我们可以使用File::Compare模块轻松比较两个文件的内容。该模块提供了一个名为compare的函数，它有助于比较指定给它的两个文件的内容作为参数。如果两个文件中存在的数据相同，则函数返回0作为输出，如果传递的文件中的数据不同，则返回值为1 ，如果在访问指定/传递时发生任何错误文件，它将值返回为-1 。句法：

use File::Compare;
$compare = compare('FILE_NAME_1', 'FILE_NAME_2');

笔记：

Same Content: Return Value [0]

Different Content: Return Value [1]

Error in Accessing Files: Return Value [-1]

例子：文件夹中存在的文件。
当文件的内容相同时：

#!/usr/bin/perl
print "Content-type: text/html\n\n";
  
# Module to use compare function
use File::Compare;
  
# compare function to access the passed files.
$compare = compare("gfg_a.txt", "gfg_c.txt");
  
# checking if the files are same
if ($compare == 0)
{
    print "Files are equal. \n";
}
  
# checking if the files are different
elsif ($compare == 1)
{
    print "Files are not equal. \n";
}
  
# checking if the file is not accessible
elsif($compare == -1)
{
    print "Error Occured. \n";
}
  
exit;

输出：
当文件的内容不同时：

#!/usr/bin/perl
print "Content-type: text/html\n\n";
  
# Module to use compare function
use File::Compare;
  
# compare function to access the passed files.
$compare = compare("gfg_a.txt", "gfg_b.txt");
  
# checking if the files are same
if ($compare == 0)
{
    print "Files are equal. \n";
}
  
# checking if the files are different
elsif ($compare == 1)
{
    print "Files are not equal. \n";
}
  
# checking if the file is not accessible
elsif($compare == -1)
{
    print "Error Occured. \n";
}
  
exit;

输出：
当文件不可访问时：

#!/usr/bin/perl
print "Content-type: text/html\n\n";
  
# Module to use compare function
use File::Compare;
  
# compare function to access the passed files.
$compare = compare("gfg_a.txt", "gfg_d.txt");
  
# checking if the files are same
if ($compare == 0)
{
    print "Files are equal. \n";
}
  
# checking if the files are different
elsif ($compare == 1)
{
    print "Files are not equal. \n";
}
  
# checking if the file is not accessible
elsif($compare == -1)
{
    print "Error occurred. The file is not accessible. \n";
}
  
exit;

输出：