Setting Variables in expect Scripts From Shell Output

Roger Olofsson raggen at
Mon Feb 25 20:22:04 UTC 2008

Martin McCormick skrev:
> 	While running an expect script, is it possible to set an
> expect script variable to the string kept in a shell variable?
> 	I can generate the shell variable just fine but when I
> try to export it to the expect script for later use with something like:
> set LOGFILENAME [exec echo \$TMPFILE]
> something happens without error, but a later attempt to see the
> contents of it such as
> send_user "$LOGFILENAME\n"
> proves that it never got set. It just echoes the literal string
> Thanks.
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If you're not too worried about speed my old trick to circumvent this 
was to simply write the variable to a temporary file then read in that 
file for the send_user thing later on...Providing the send_user is a 
script, mind you.

Just my nickels worth...remember to delete the tempfile though.


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