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Top Forums UNIX for Dummies Questions & Answers nohup - sub job in script not executing until I exit Post 302445330 by ido1957 on Sunday 15th of August 2010 10:42:57 AM

08-15-2010

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I can add some more - I launch the script using nohup and it executes a series of lines then stops at a particular line while that line executes.

This line calls a sub - script that gathers data for a log file. If I exit too soon during the execution of the sub script it sends a hup to the sub script and that sub script stops with no data in the log - say after an hour. I waited 5 hours before that to exit and the sub script was still hanging but it ended without a hup and put the log data in the log file.
This sub script runs for an undetermined amount of time - I have no idea how long it runs as I can't tell if it's doing anything or waiting or hanging.
If anyone can tell me how I can tell if the sub script is actually doing anything or just hanging that would be great. And tell me why the sub script would get a hup when I used nohup to launch the original script.

Also after the sub script stops, a few kill commands from the original script do execute. So why would the sub script stop working with a hup and the kill commands stil get executed?

ido1957

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LEARN ABOUT OPENDARWIN

NOHUP(1)						    BSD General Commands Manual 						  NOHUP(1)

NAME

     nohup -- invoke a utility immune to hangups

SYNOPSIS

     nohup [--] utility [arguments]

DESCRIPTION

     The nohup utility invokes utility with its arguments and at this time sets the signal SIGHUP to be ignored.  If the standard output is a ter-
     minal, the standard output is appended to the file nohup.out in the current directory.  If standard error is a terminal, it is directed to
     the same place as the standard output.

     Some shells may provide a builtin nohup command which is similar or identical to this utility.  Consult the builtin(1) manual page.

ENVIRONMENT

     The following variables are utilized by nohup:

     HOME  If the output file nohup.out cannot be created in the current directory, the nohup utility uses the directory named by HOME to create
	   the file.

     PATH  Used to locate the requested utility if the name contains no '/' characters.

DIAGNOSTICS

     The nohup utility exits with one of the following values:

     126     The utility was found, but could not be invoked.

     127     The utility could not be found or an error occurred in nohup.

     Otherwise, the exit status of nohup will be that of utility.

SEE ALSO

     builtin(1), csh(1), signal(3)

STANDARDS

     The nohup utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BUGS

     Two or more instances of nohup can append to the same file, which makes for a confusing output.

BSD
								   July 19, 2001							       BSD