Re: Cygwin 1.3.10 read command and W2K

[Randall R Schulz <rrschulz at cris dot com>]

Gerald,

[ The usual disclaimer: None of this is Cygwin specific. ]


When you use a pipe, the shell forks. In your example, the read command was 
occurring in a forked sub-shell, and hence the side-effect on $var is not 
seen in the shell that reads and interprets the pipeline you gave (and 
subsequent commands).

Compare the output of this pipeline:

% echo foo |read bar; echo $bar

%

With that of this one:

% echo foo | (read bar; echo $bar)
foo
%


Depending on the complexity of your script, this construct might work:

% bar="$(echo foo)"
% echo $bar
foo


Randall Schulz
Mountain View, CA USA



At 13:01 2002-06-06, Gerald Reno wrote:

> I have scripts with reads that are failing.  Why doesn't "echo text | read 
> var; echo $var" work?  var is just empty.  Doesn't 'read' default to 
> stdin?  All other commands seem to be working only read is having problem.

--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/