in reply to
Incorrect value 0 reported in command execution return value variable $?, when trying with expect->send command
Insert this line and the solution will reveal before your weary eyes...
print "$command ; echo COMMAND_RET:$? | sed 's/^/COMMAND_OUT: /g'; ech
+o -n END_; echo EXPECT\n";
Hint: You need to escape
$?.
Why not get rid of the sed-invocation?
$exp->send("$command ; echo 'COMMAND_OUT: COMMAND_RET:'\$?; echo END_E
+XPECT\n");
Depending on the shells flavour of
echo, you could also get rid of the second echo invocation.