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From: Bela Lubkin <belal@caldera.com>
Subject: Re: New /etc/default/cron from OSS642a - Cron supplement
Date: Tue, 17 Dec 2002 19:44:42 GMT References: <fc5ef85a.0212160509.4e33e924@posting.google.com> <20021216171623.GA10825@jpradley.jpr.com> <fc5ef85a.0212170259.621d72f7@posting.google.com>


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alex stuart wrote:



> Jean-Pierre Radley <jpr@jpr.com> wrote in message news:<20021216171623.GA10825@jpradley.jpr.com>...
> > alex stuart typed (on Mon, Dec 16, 2002 at 05:09:58AM -0800):
> > | It appears that during the install of the oss642a patch, a new
> > | /etc/default/cron is installed.
> <snip> 
> > But /etc/default/cron describes the purpose of each of those
> > variables; which part of the text leaves you with "cannot
> > determine what they are for"?

> Did it? I read only the lines that appeared to be shell envvar assignment
> statements. I'm sorry I can't recheck this: I lost my job yesterday and
> now don't have access to an OpenServer box.

> /etc/default/cron appeared to have the same syntax as a shell script. It
> has lines like "OLDPARSING=YES" which appears to be an assignment; and
> comments are introduced with a "#". When I ran a shell script from cron,
> I could echo the PATH variable, set as above, but was unable to access
> the NOTESHELL, INPUT and OLDPARSING envvars (l.h.sides?). I did not notice
> a new man page distributed with the VOLS containing descriptions.














A new man page was not included, but comments were added to
/etc/default/cron, as JPR stated.  I just downloaded a fresh copy of
oss642a, extracted etc/default/cron from it, and here is an excerpt:
 #       NOTESHELL  - If set to YES, users submitting cron and at jobs are
  #                    notified if their login shell is different from the shell
  #                    that is used by cron to run jobs.



Setting this to NO turns off the annoying warning:



  "warning: commands will be executed using /bin/sh"

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  #       INPUT      - If set to NO, the cron job input mechanism is disabled:
  #                    neither % nor \ are changed, removed, or otherwise treated
  #                    specially.
  #       OLDPARSING - If set to YES, \ and % in cron jobs are acted on in the
  #                    way they were up through OpenServer 5.0.6.



These control the parsing of lines in a crontab.  It is an attempt to
get control over an old feature that few people knew about, but which
caused trouble in some crontabs: '%' means `newline'.



There are three combinations:









  INPUT=YES, OLDPARSING=YES -- acts like cron in OSR506 and earlier.  If
  there are any '%' chars in a crontab command field, they are converted
  to newlines.  The command (everything before the first newline) is
  passed the rest as standard input.  So:



     * * * * * cat%foo%bar%



  means: ``every minute, run `cat`, passing as standard input a file
  with 2 lines containing the texts "foo" and "bar"''.



  =========================================================================



  INPUT=YES, OLDPARSING=NO (default configuration in OSR507 and oss642a)
  -- same, except now you can prevent the special interpretation of '%'
  chars with a backslash.  So:



    * * * * * echo foo%bar



  means: ``every minute, run `echo foo`, passing as stdin a file with
  one line containing "bar"''.  But:



    * * * * * echo foo\%bar



  means: ``every minute, run `echo foo%bar`''.



  NOTICE that this changes the meaning of '\' in existing crontabs.  To
  express a literal '\' you need two of them:



    * * * * * printf "This outputs\\ntwo lines."



  =========================================================================



  INPUT=NO, OLDPARSING=(ignored) -- characters '%' and '\' have no
  special meaning in crontab lines.  So:



    * * * * * echo foo%bar
    * * * * * echo foo\%bar



  means: ``every minute, run `echo foo%bar`'', and ``every minute, run
  `echo foo\%bar`''



>Bela<








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