Exit to while read Post: 303007152

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Top Forums Shell Programming and Scripting Exit to while read Post 303007152 by Don Cragun on Sunday 12th of November 2017 06:10:36 PM

11-12-2017

Registered User

Quote:

Originally Posted by RudiC

Wouldn't a case statement lend itself to evaluating the patterns in func_monitoring?

Yes. Using case patterns to match lines instead of using test's = operator would help if matching words on a line instead of looking for exact matches to a complete line is the desired goal.

But, making that change won't affect when tail terminates after the remainder of the pipeline terminates. For that we need to know what shell is being used and what version of that shell. I've shown a way to make it work with the Korn shell if I understand what lxdorney is trying to do correctly (and I'm not sure that I do). I believe that some versions of bash have an option to make the last process in a pipeline the process group leader of that pipeline (like ksh does) instead of the first process in the pipeline (like bash does by default), but I'm not going to try to research ways to do this in every possible shell when lxdorney could tell us what version of what shell is being used so we could reasonably limit our research.

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wait

wait(1) 						      General Commands Manual							   wait(1)

NAME

       wait - await process completion

SYNOPSIS

       [pid]

DESCRIPTION

       If  no argument is specified, waits until all processes (started with of the current shell have completed, and reports on abnormal termina-
       tions.  If a numeric argument pid is given and is the process ID of a background process, waits until that process has  completed.   Other-
       wise, if pid is not a background process, exits without waiting for any processes to complete.

       Because the system call must be executed in the parent process, the shell itself executes without creating a new process (see wait(2)).

   Command-Line Arguments
       supports the following command line arguments:

	      The unsigned decimal integer process
			  ID of a command, whose termination is to wait for.

WARNINGS

       Some processes in a 2-or-more-stage pipeline may not be children of the shell, and thus cannot be waited for.

SEE ALSO

       csh(1), ksh(1), sh-posix(1), sh(1), wait(2).

STANDARDS CONFORMANCE

																	   wait(1)

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