01-11-2010
Redirect produces zero byte file
I my shell script I call a program and redirect the output to a file.
mypgm > myoutput.file
Once in a while, the output file is zero byte.
The programmer of mypgm said the program always produce some output.
Is there any situation where a redirect will create a zero byte file even if the program actually output something. I want to be sure before I go back to challenge the programmer.
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LEARN ABOUT OSX
mail::spf::mod::redirect
Mail::SPF::Mod::Redirect(3) User Contributed Perl Documentation Mail::SPF::Mod::Redirect(3)
NAME
Mail::SPF::Mod::Redirect - SPF record "redirect" modifier class
DESCRIPTION
An object of class Mail::SPF::Mod::Redirect represents an SPF record modifier of type "redirect".
Constructors
The following constructors are provided:
new(%options): returns Mail::SPF::Mod::Redirect
Creates a new SPF record "redirect" modifier object.
%options is a list of key/value pairs representing any of the following options:
domain_spec
See "new" in Mail::SPF::Mod.
new_from_string($text, %options): returns Mail::SPF::Mod::Redirect; throws Mail::SPF::ENothingToParse, Mail::SPF::EInvalidMod
Creates a new SPF record "redirect" modifier object by parsing the string and any options given.
Class methods
The following class methods are provided:
name: returns string
Returns 'redirect'.
name_pattern: returns Regexp
Returns a regular expression that matches a modifier name of 'redirect'.
precedence: returns real
Returns a precedence value of 0.8. See "precedence" in Mail::SPF::Mod.
Instance methods
The following instance methods are provided:
params
See "params" in Mail::SPF::Mod.
domain_spec: returns Mail::SPF::MacroString
Returns the "domain-spec" parameter of the modifier.
process($server, $request, $result): throws Mail::SPF::Result
If no mechanism matched during the evaluation of the current SPF record, performs a recursive SPF check using the given SPF server and
request objects and substituting the modifier's target domain name for the request's authority domain. The result of the recursive SPF
check is then thrown as the result of the current record's evaluation. However, if the target domain has no acceptable SPF record, a
"permerror" result is thrown. See RFC 4408, 6.1, for details.
See Mail::SPF::Mod for other supported instance methods.
SEE ALSO
Mail::SPF, Mail::SPF::Mod, Mail::SPF::Term, Mail::SPF::Record
<http://tools.ietf.org/html/rfc4408>
For availability, support, and license information, see the README file included with Mail::SPF.
AUTHORS
Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>
perl v5.16.2 2013-08-25 Mail::SPF::Mod::Redirect(3)