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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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print(1)							   User Commands							  print(1)

NAME
print - shell built-in function to output characters to the screen or window SYNOPSIS
ksh print [ -Rnprsu [n]] [arg...] DESCRIPTION
ksh The shell output mechanism. With no flags or with flag - or -, the arguments are printed on standard output as described by echo(1). OPTIONS
The following options are supported: -n suppresses new-line from being added to the output. -R -r (raw mode) ignore the escape conventions of echo. The -R option will print all subsequent arguments and options other than -n. -p causes the arguments to be written onto the pipe of the process spawned with |& instead of standard output. -s causes the arguments to be written onto the history file instead of standard output. -u [ n ] flag can be used to specify a one digit file descriptor unit number n on which the output will be placed. The default is 1. EXIT STATUS
The following exit values are returned: 0 Successful operation. >0 Output file is not open for writing. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
echo(1), ksh(1), attributes(5) SunOS 5.10 15 Apr 1994 print(1)
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