Shell (bash, (pd)ksh, zsh, /not/ ash) + exec + here-doc + redirect == trouble!

[Bas van Gompel]

Hi,

Try the following script:

=== begin testexec.sh ===
#!/bin/ksh

exec 5<&0 /bin/ksh <<EOSH
echo "First exec: Done."
exec 0<&5
echo "Second exec: Done."
exit 0
EOSH
==== end testexec.sh ====

(Replace ksh with bash or zsh at will, above.)

For me, this prints ``First exec: Done.'', then leaves me to type
shell-commands, _which are executed_, until I press EOF (^D).

In ash it prints ''

  First exec: Done.
  Second exec: Done.

'', as I expected. Compare p.e.

=== begin testexec2.sh ===
#!/bin/bash

echo 'echo "First exec: Done."
exec 0<&5
echo "Second exec: Done."
exit 0' |exec 5<&0 /bin/bash

==== end testexec2.sh ====

, which also performs as expected.

Has anybody got a clue?

Is this cygwin-specific?

Are all these shells borrowing code from eachother?


L8r,

Buzz.
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