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Full Discussion: Conditional Cron
Top Forums Shell Programming and Scripting Conditional Cron Post 302112795 by Perderabo on Friday 30th of March 2007 10:35:37 AM
Old 03-30-2007
First, the backslash is required. From the crontab man page:
Quote:
The sixth field of a line in a crontab file is a string that is executed by the shell at the specified times. A percent character in this field (unless escaped by \) is translated to a NEWLINE character.
Some versions of cron are smart enough to remove that blackslash prior to passing it to the shell. Others just leave it there. So the shell will see:
[ \30 -eq 30 ]
Most shells will get that right but some versions of the bourne shell will not. You are probably using Solaris which has both behaviors. My advice is to put shell scripting into a shell script which is executed by a modern shell. If you must get this to work, use eval with the date command
Code:
34 13 * * * [ `eval date +'\%d'` -eq `cal | grep -v "^$" | tail -1 | awk '{print $NF-1}'` ] && /export/myshell.sh

 

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LEARN ABOUT OSX

platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)
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