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Full Discussion: ksh bug?
Top Forums UNIX for Advanced & Expert Users ksh bug? Post 302875823 by MadeInGermany on Wednesday 20th of November 2013 12:21:28 PM
Old 11-20-2013
ksh bug?

I think I discovered a bug in ksh.
Code:
$ cat test.sh
x=`echo hello | cat 2>&1 >/dev/null`
echo $x
y=`echo hello | cat >/dev/null 2>&1`
echo $y

works with all shells, including ksh in normal mode.
But does not work with ksh -x:
Code:
$ ksh -x test.sh
+ + echo hello
+ cat
+ 2>& 1 x=1> /dev/null
+ echo 1> /dev/null
1> /dev/null
+ + echo hello
+ cat
+ 1> /dev/null 2>& 1
y=
+ echo

sh -x or bash -x or zsh -x do it correctly:
Code:
$ bash -x test.sh
++ echo hello
++ cat
+ x=
+ echo

++ echo hello
++ cat
+ y=
+ echo

 

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BOOLVAL(3)								 1								BOOLVAL(3)

boolval - Get the boolean value of a variable

SYNOPSIS
boolean boolval (mixed $var) DESCRIPTION
Returns the boolean value of $var. PARAMETERS
o $var - The scalar value being converted to a boolean. RETURN VALUES
The boolean value of $var. EXAMPLES
Example #1 boolval(3) examples <?php echo '0: '.(boolval(0) ? 'true' : 'false')." "; echo '42: '.(boolval(42) ? 'true' : 'false')." "; echo '0.0: '.(boolval(0.0) ? 'true' : 'false')." "; echo '4.2: '.(boolval(4.2) ? 'true' : 'false')." "; echo '"": '.(boolval("") ? 'true' : 'false')." "; echo '"string": '.(boolval("string") ? 'true' : 'false')." "; echo '"0": '.(boolval("0") ? 'true' : 'false')." "; echo '"1": '.(boolval("1") ? 'true' : 'false')." "; echo '[1, 2]: '.(boolval([1, 2]) ? 'true' : 'false')." "; echo '[]: '.(boolval([]) ? 'true' : 'false')." "; echo 'stdClass: '.(boolval(new stdClass) ? 'true' : 'false')." "; ?> The above example will output: 0: false 42: true 0.0: false 4.2: true "": false "string": true "0": false "1": true [1, 2]: true []: false stdClass: true SEE ALSO
floatval(3), intval(3), strval(3), settype(3), is_bool(3), Type juggling. PHP Documentation Group BOOLVAL(3)
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