Hi All
Can expr handle decimal point

cnt_idle=23
#expr $cnt_idle / 8.0
expr: 0402-046 A specified operator requires numeric parameters.

#expr $cnt_idle / 8
2

moonhk

On Sep 5, 12:14 pm, moonhk <moon_ils...@yahoo.com.hk> wrote:
> Hi All
> Can expr handle decimal point
>
> cnt_idle=23
> #expr $cnt_idle / 8.0
> expr: 0402-046 A specified operator requires numeric parameters.
>
> #expr $cnt_idle / 8
> 2
>
> moonhk

This depends on your version of shell
in ksh93 for example, you can declare a floating point variable:
set -F var_name

moonhk wrote:

> Hi All
> Can expr handle decimal point
>
> cnt_idle=23
> #expr $cnt_idle / 8.0
> expr: 0402-046 A specified operator requires numeric parameters.
>
> #expr $cnt_idle / 8
> 2
>
> moonhk
>

expr won't work with float

try like this :

echo "scale=2;$cnt_idle / 8" | bc -l


Regards,
Thobias Vakayil

On Wed, 05 Sep 2007 09:40:52 -0000, hyperboogie
<hyperboogie@gmail.com> wrote:
>
>
> On Sep 5, 12:14 pm, moonhk <moon_ils...@yahoo.com.hk> wrote:
>> Hi All
>> Can expr handle decimal point
>>
>> cnt_idle=23
>> #expr $cnt_idle / 8.0
>> expr: 0402-046 A specified operator requires numeric parameters.
>>
>> #expr $cnt_idle / 8
>> 2
>>
>> moonhk
>
> This depends on your version of shell
> in ksh93 for example, you can declare a floating point variable:
> set -F var_name
>
If the shell allows floating point, it may be allowed only in $(( )) or
let var=expression.


--
lisp, v.:
To call a spade a thpade.

On 2007-09-05, hyperboogie wrote:
> On Sep 5, 12:14 pm, moonhk <moon_ils...@yahoo.com.hk> wrote:
>> Hi All
>> Can expr handle decimal point
>>
>> cnt_idle=23
>> #expr $cnt_idle / 8.0
>> expr: 0402-046 A specified operator requires numeric parameters.
>>
>> #expr $cnt_idle / 8
>> 2
>>
>> moonhk
>
> This depends on your version of shell

No, expr doesn't know about floating point numbers, regardless of
shell.

> in ksh93 for example, you can declare a floating point variable:
> set -F var_name

Any shell can have a floating point variable, but most shells
cannot perform arithmetic operations on it.

--
Chris F.A. Johnson, author <http://cfaj.freeshell.org/shell/>
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, assumes the POSIX locale
===== and is released under the GNU General Public Licence

2007-09-5, 11:00(-04), Chris F.A. Johnson:
[...]
>> in ksh93 for example, you can declare a floating point variable:
>> set -F var_name
>
> Any shell can have a floating point variable, but most shells
> cannot perform arithmetic operations on it.
[...]

shells are tools to call other tools. So all shells can do
floating point arithmetic, they just need to call utilities that
do floating point arithmetics such as bc or awk.

If you mean internally, then you just need to find a shell that
has bc or awk built in, but why would you care if they are
builtin or not?

zsh and ksh93 have special constructs to do floating point
arithmetics without calling a command.

--
Stéphane

On 9 6 , 5 27 , Stephane CHAZELAS <this.addr...@is.invalid> wrote:
> 2007-09-5, 11:00(-04), Chris F.A. Johnson:
> [...]>> in ksh93 for example, you can declare a floating point variable:
> >> set -F var_name
>
> > Any shell can have a floating point variable, but most shells
> > cannot perform arithmetic operations on it.
>
> [...]
>
> shells are tools to call other tools. So all shells can do
> floating point arithmetic, they just need to call utilities that
> do floating point arithmetics such as bc or awk.
>
> If you mean internally, then you just need to find a shell that
> has bc or awk built in, but why would you care if they are
> builtin or not?
>
> zsh and ksh93 have special constructs to do floating point
> arithmetics without calling a command.
>
> --
> Stéphane

Hi All
Thank. I will using bc for decimal calculation.

moonhk

On 9 6 , 5 27 , Stephane CHAZELAS <this.addr...@is.invalid> wrote:
> 2007-09-5, 11:00(-04), Chris F.A. Johnson:
> [...]>> in ksh93 for example, you can declare a floating point variable:
> >> set -F var_name
>
> > Any shell can have a floating point variable, but most shells
> > cannot perform arithmetic operations on it.
>
> [...]
>
> shells are tools to call other tools. So all shells can do
> floating point arithmetic, they just need to call utilities that
> do floating point arithmetics such as bc or awk.
>
> If you mean internally, then you just need to find a shell that
> has bc or awk built in, but why would you care if they are
> builtin or not?
>
> zsh and ksh93 have special constructs to do floating point
> arithmetics without calling a command.
>
> --
> Stéphane

Hi All
Thank. I will using bc for decimal calculation.

moonhk

On 2007-09-05, Stephane CHAZELAS wrote:
> 2007-09-5, 11:00(-04), Chris F.A. Johnson:
> [...]
>>> in ksh93 for example, you can declare a floating point variable:
>>> set -F var_name
>>
>> Any shell can have a floating point variable, but most shells
>> cannot perform arithmetic operations on it.
> [...]
>
> shells are tools to call other tools.

The shell is also a full programming language, and complex programs
can be written in a POSIX shell without using external commands,
which make a script considerably slower. Even more can be done with
a shell that has other extensions (arrays, more parameter
expansions, etc.), such as bash and ksh93.

--
Chris F.A. Johnson, author <http://cfaj.freeshell.org/shell/>
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, assumes the POSIX locale
===== and is released under the GNU General Public Licence