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Full Discussion: while loop checking for file
Top Forums Shell Programming and Scripting while loop checking for file Post 302591083 by rwuerth on Wednesday 18th of January 2012 12:44:08 PM
Old 01-18-2012
Try to put this into psuedo code. From what your saying, I interpret your psuedo code to look something like the following:

Main.ksh
Code:
while <condition: filename "*.run" exists>
do
  <optional: do some processing here>
  for <variable> in <condition: ???>
  do
    <optional: do some processing here> 
    run loader.ksh
    <optional: do some processing here>
  done  # for loop
  <optional: do some processing here>
  wait 2 hours
done # while loop

I assume your "for loop" is so that you can run multiple loader.ksh files? I don't know the condition for such, that would be for you to determine.

Also, "nohup" will not run loader.ksh in parallel. It will allow loader.ksh to continue even if the Main.ksh process is killed. You need the ampersand (&) in order to make it so that the Main.ksh script does not wait for loader.ksh to finish, which would allow you to run multiple loader.ksh scripts. You can apply both if that is your desire,
i.e.

Code:
 
nohup ksh loader.ksh &

In the psuedo code, I'm just stating that you "run loader.ksh" so that the details can be worked out when more information is known. You should understand that these are separate conditions with different commands/modifiers (nohup and '&').
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LEARN ABOUT SUNOS

break

break(1)							   User Commands							  break(1)

NAME

       break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until	loop

SYNOPSIS

   sh
       break [n]

       continue [n]

   csh
       break

       continue

   ksh
       *break [n]

       *continue [n]

DESCRIPTION

   sh
       The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels.

       The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop.

   csh
       The  break  utility  resumes  execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current
       line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line.

       The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop.

   ksh
       The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified,	then  break  n	levels.  If  n	is
       greater than the number of enclosing loops, the outermost enclosing loop shall be exited.

       The  continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n-
       th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used.

       On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:

       1.  Variable assignment lists preceding the command remain in effect when the command completes.

       2.  I/O redirections are processed after variable assignments.

       3.  Errors cause a script that contains them to abort.

       4.  Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a  vari-
	   able  assignment.  This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera-
	   tion are not performed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), exit(1), ksh(1), sh( 1), attributes(5)

SunOS 5.10							    17 Jul 2002 							  break(1)
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