09-12-2006
crontab -e is used to edit (modify) the crontab file. Piping it to more is no use. You may want to look at crontab -l. The crontab command also does error checking on the edited/modified file and will not update the actual crontab file unless the new file is error free.
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Why does this cron entry do nothing? It works interactively.
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HI all,
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I want to run a script on (say) the 4th friday every month. But if I include this line in the crontab :
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Hey out there
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LEARN ABOUT SUSE
set::crontab
Crontab(3) User Contributed Perl Documentation Crontab(3)
NAME
Set::Crontab - Expand crontab(5)-style integer lists
SYNOPSIS
$s = Set::Crontab->new("1-9/3,>15,>30,!23", [0..30]);
if ($s->contains(3)) { ... }
DESCRIPTION
Set::Crontab parses crontab-style lists of integers and defines some utility functions to make it easier to deal with them.
Syntax
Numbers, ranges, *, and step values all work exactly as described in crontab(5). A few extensions to the standard syntax are described
below.
< and >
<N selects the elements smaller than N from the entire range, and adds them to the set. >N does likewise for elements larger than N.
! !N excludes N from the set. It applies to the other specified range; otherwise it applies to the specified ranges (i.e. "!3" with a
range of "1-10" corresponds to "1-2,4-10", but ">3,!7" in the same range means "4-6,8-10").
Functions
new($spec, [@range])
Creates a new Set::Crontab object and returns a reference to it.
contains($num)
Returns true if $num exists in the set.
list()
Returns the expanded list corresponding to the set.
The functions described above croak if they are called with incorrect arguments.
SEE ALSO
crontab(5)
AUTHOR
Abhijit Menon-Sen <ams@toroid.org>
Copyright 2001 Abhijit Menon-Sen <ams@toroid.org>
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.12.1 2008-07-30 Crontab(3)