[nflug] Linux & Korn Shell Question

[Robert Meyer]

This is a difficult one.  Some versions of shells will run pipes in subshells. 
That means that the variables would get set in the subshell and not in the
primary shell.  Not sure if that's what's happening to you or not.  You might
want to dump the data to a /tmp/ file and issue the read like this:
read user terminal < /tmp/tmpfile

Just a thought...

Cheers!

Bob

--- Michael James <jamesm at thundertux.org> wrote:

> I'm transferring a script from an IBM AIX box to a Red Hat Enterprise 
> Linux server.  One of the first lines in the script determines the 
> logged in user and terminal the script is running under.  The syntax is:
> 
> who am i | awk '{ printf "%s %s\n", $1, $2; } ' | read user terminal
> 
> The first part give the standard output for the "who am i" command, the 
> first field being the user and the second the terminal.  The "awk" 
> command prints just the user and terminal with the idea that the output 
> will be piped into the read command, giving me shell variables for the 
> user and the terminal.  This line works fine under AIX and the Korn 
> shell.  On Linux, each piece works fine at the CLI, but the entire line 
> doesn't give me any values for the user and terminal variables.  I 
> believe the issue is within the pipe.  Is there some parameter, switch 
> or something that needs to be different under LInux?  The begining of 
> the script is forcing the shell to the korn shell (/bin/ksh) and I've 
> verified that.  Any help would be appreciated.
> 
> Michael R. James
> jamesm at thundertux.org
> 
> _______________________________________________
> nflug mailing list
> nflug at nflug.org
> http://www.nflug.org/mailman/listinfo/nflug
> 


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