file::checktree.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "File::CheckTree 3"
.TH File::CheckTree 3 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
File::CheckTree \- run many filetest checks on a tree
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use File::CheckTree;
\&
\&    $num_warnings = validate( q{
\&        /vmunix                 \-e || die
\&        /boot                   \-e || die
\&        /bin                    cd
\&            csh                 \-ex
\&            csh                 !\-ug
\&            sh                  \-ex
\&            sh                  !\-ug
\&        /usr                    \-d || warn "What happened to $file?\en"
\&    });
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fIvalidate()\fR routine takes a single multiline string consisting of
directives, each containing a filename plus a file test to try on it.
(The file test may also be a \*(L"cd\*(R", causing subsequent relative filenames
to be interpreted relative to that directory.)  After the file test
you may put \f(CW\*(C`|| die\*(C'\fR to make it a fatal error if the file test fails.
The default is \f(CW\*(C`|| warn\*(C'\fR.  The file test may optionally have a "!' prepended
to test for the opposite condition.  If you do a cd and then list some
relative filenames, you may want to indent them slightly for readability.
If you supply your own \fIdie()\fR or \fIwarn()\fR message, you can use \f(CW$file\fR to
interpolate the filename.
.PP
Filetests may be bunched:  \*(L"\-rwx\*(R" tests for all of \f(CW\*(C`\-r\*(C'\fR, \f(CW\*(C`\-w\*(C'\fR, and \f(CW\*(C`\-x\*(C'\fR.
Only the first failed test of the bunch will produce a warning.
.PP
The routine returns the number of warnings issued.
.SH "AUTHOR"
.IX Header "AUTHOR"
File::CheckTree was derived from lib/validate.pl which was
written by Larry Wall.
Revised by Paul Grassie <\[e-mail]\fR> in 2002.
.SH "HISTORY"
.IX Header "HISTORY"
File::CheckTree used to not display fatal error messages.
It used to count only those warnings produced by a generic \f(CW\*(C`|| warn\*(C'\fR
(and not those in which the user supplied the message).  In addition,
the \fIvalidate()\fR routine would leave the user program in whatever
directory was last entered through the use of \*(L"cd\*(R" directives.
These bugs were fixed during the development of perl 5.8.
The first fixed version of File::CheckTree was 4.2.