exit status of eval exec


 
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# 1  
Old 06-06-2008
exit status of eval exec

I am using ksh88 and I am trying to catch the return status of opening a file using a file descriptor and the exec and eval commands. However I am not having much success. Here is what I have:

eval "exec $next_fh>$1"

This opens the file if the file is $1 is valid, however I want to make sure it is valid. I tried:

command eval "exec $next_fh>$1" || print -u2 "Unable to open log file: $1"; return 1

This works, but I return the $next_fh value to the calling script and for some reason it does not execute the print above but it is evaluated and returned to the calling script and I get a bad file descriptor.

Any help would be appreciated. Thanks.
# 2  
Old 06-06-2008
Well you can't do that. It's an interesting thought but ksh doesn't work like that. Normally you do something like:
date > date.out
and the return code has to be tied to the command, not the redirection. If exec returns, it returns a true exit code. There are a bunch of "if" tests that can be done on files and you will need to find a way to use that.
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