Hi:
How could I intercept "enter" key using a case statement?

Thank you.

apogeusistemas [at] gmail.com wrote:
> Hi:
> How could I intercept "enter" key using a case statement?
>
> Thank you.


That could mean just about anything. Prtovide some more details
including sample input and expected output.

Ed.

On 2008-01-10, apogeusistemas [at] gmail.com wrote:
>
> How could I intercept "enter" key using a case statement?


LF=$( printf "\n" )
CR=$( printf "\r" )

case $KEY in
"$LF") echo Line feed entered ;;
"$CR") echo Carriage return entered ;;
esac

--
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

On Jan 10, 7:36 am, apogeusiste... [at] gmail.com wrote:
> Hi:
> How could I intercept "enter" key using a case statement?

What do you mean? Can you provide a code example of what you currently
have?

-Ed
--
(You can't go wrong with psycho-rats.)(http://mi.eng.cam.ac.uk/~er258)

/d{def}def/f{/Times s selectfont}d/s{11}d/r{roll}d f 2/m{moveto}d -1
r
230 350 m 0 1 179{1 index show 88 rotate 4 mul 0 rmoveto}for/s 12 d f
pop 235 420 translate 0 0 moveto 1 2 scale show showpage

On Thu, 10 Jan 2008 13:01:53 -0500, Chris F.A. Johnson wrote:
> On 2008-01-10, apogeusistemas [at] gmail.com wrote:
>>
>> How could I intercept "enter" key using a case statement?
>
>
> LF=$( printf "\n" )

That won't work. Command substitution removes all the trailing LFs.

LF='
'

or:

eval "$(printf 'LF="\n"')"

or:

LF=$(printf '\n.'); LF=${LF%.}

....

--
Stephane

In article
<dbdbb108-879f-43fc-8683-03bdb21736e9 [at] i72g2000hsd.googlegroups.com>,
apogeusistemas [at] gmail.com wrote:

> Hi:
> How could I intercept "enter" key using a case statement?
>
> Thank you.

Do you mean you want to detect when the user has typed an empty response
to a question?

read response
if [ -z "$response" ]
then echo Please type something
else echo "You typed '$response'"
fi

--
Barry Margolin, barmar [at] alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***

apogeusiste... [at] gmail.com wrote:
> How could I intercept "enter" key using a case statement?

A general method from the Kornshell FAQ at
http://kornshell.com/doc/faq.html :

Q4. How can a write a ksh script that responds directly to each
character so that you user just has to enter y, not y<return>?
A4. There are two ways to do this. The easiest is to use:

read -n1 x

Alternatively, you could do:

function keytrap
{
.sh.edchar=${sh.edchar}$'\n'
}
trap keytrap KEYBD

and then:

read x

=Brian