UNIX for Advanced & Expert Users

Hi!!

Is there a possibility to call/start a subproces using ksh ??
Hope that there is somebody to help me.

thanks in advance.

Corine

That is pretty much the normal case.

Code:

#! /usr/bin/ksh
date
exit 0

In the above script, the date command will be a subprocess of ksh. A few commands like "echo" are built-ins so they are not run as subprocesses.

What I meant to say was using the nohup to call a script in another script.

So something like:

nohup ./dump.sh databasename &

And then that line in another script.
Is that possible ?
Or do I need to call the mainscript with nohup and just put the line:

./dump.sh databasename

in the script?

I hope you understand what I mean.

You can use nohup inside a script if you want to. But I think nohup was really intended to be used from the command line.

Different versions of nohup ignore different signals. Sun actually supplies two different versions. It writes to nohup.out if it can or $HOME/nohup.out if the current directory is not writable. A script that silently invokes nohup might interfer with a user's use of nohup with both writing to the same nohup.out file.

Inside a script, ignoring signals is easy. A script can in effect nohup itself by simply using:
trap "" HUP QUIT
and there is no question about whether or not QUIT is being ignored. Want to ignore TERM too? Just use:
trap "" HUP QUIT TERM
And now you can redirect the output whereever you want leaving nohup.out available for mamual use.

In my above script, you could do:
nohup date &
but
( trap "" HUP QUIT TERM ; exec date > date.out 2>&1 ) &
pretty much does the same thing, but gives me much more control over what is happening. Remember that parentheses start a subshell, so the trap inside the subshell does not affect the outer shell.