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.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
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.\" ========================================================================
.\"
.IX Title "File::Compare 3perl"
.TH File::Compare 3perl "2023-11-25" "perl v5.36.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
File::Compare \- Compare files or filehandles
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use File::Compare;
\&
\& if (compare("file1","file2") == 0) {
\& print "They\*(Aqre equal\en";
\& }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The File::Compare::compare function compares the contents of two
sources, each of which can be a file or a file handle. It is exported
from File::Compare by default.
.PP
File::Compare::cmp is a synonym for File::Compare::compare. It is
exported from File::Compare only by request.
.PP
File::Compare::compare_text does a line by line comparison of the two
files. It stops as soon as a difference is detected. \fBcompare_text()\fR
accepts an optional third argument: This must be a \s-1CODE\s0 reference to
a line comparison function, which returns 0 when both lines are considered
equal. For example:
.PP
.Vb 1
\& compare_text($file1, $file2)
.Ve
.PP
is basically equivalent to
.PP
.Vb 1
\& compare_text($file1, $file2, sub {$_[0] ne $_[1]} )
.Ve
.SH "RETURN"
.IX Header "RETURN"
File::Compare::compare and its sibling functions return 0 if the files
are equal, 1 if the files are unequal, or \-1 if an error was encountered.
.SH "AUTHOR"
.IX Header "AUTHOR"
File::Compare was written by Nick Ing-Simmons.
Its original documentation was written by Chip Salzenberg.
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