tcsh hang while executing scripts which use pipes with backticks

[Sunadham, Ajay Kumar]

We are facing a similar problem as mentioned in the thread below. 

http://cygwin.com/ml/cygwin/2012-07/msg00014.html

To reproduce the issue create 2 csh files in the same directory.

First file dotest.csh:

#!/bin/csh -f

set num=20
set par=10

set i=0
while ( $i < $par )
  ./checkspace.csh $num &
  @ i++
end

wait

Second file checkspace.csh:

#!/bin/csh -f

set num=$1
set j=0
while ( $j < $num )
  set fspace=`/usr/bin/df -P -k . | tail -1`

  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`
  set free_space=`echo $fspace | tail -1 | awk '{print $4}' | tail -1`

  echo "$j $free_space"
  @ j++
end

When you run dotest.csh from a tcsh window, it will hang. It would be great if this issue can be fixed.


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