topic Re: Keyboard reading from ksh in Operating System - Linux

Keyboard reading from ksh

Leo The Cat — Mon, 09 Feb 2009 18:02:38 GMT

Hi

How to accept only the ENTER key in a ksh compatible script to provide something like that:
"Please do action ... and press ENTER"

any idea ?

Bests Regards
Den

Re: Keyboard reading from ksh

Huc_1 — Mon, 09 Feb 2009 18:20:21 GMT

Please tell us more on what you are trying to do...like where is your script failing?

enjoy, life.

Jean-Pierre Huc

Re: Keyboard reading from ksh

Steven E. Protter — Mon, 09 Feb 2009 19:19:08 GMT

Shsalom,

Here is an example. Change the script and it will still work.

#!/bin/bash

filename="/home/paul/myfile.tar.gz"
hostname="ftp.myhost.com"
username="username"
password="password"
ftp -un $hostname <quote USER $username
quote PASS $password

binary
put $filename
quit
EOF

SEP

Re: Keyboard reading from ksh

Ivan Ferreira — Mon, 09 Feb 2009 21:19:36 GMT

I'm not sure of what are you trying to do, but normally I use:

echo "Press ENTER to continue"
read
echo "Operation complete"
exit 0

Re: Keyboard reading from ksh

James R. Ferguson — Mon, 09 Feb 2009 21:27:43 GMT

Hi Den:

If you want to distinguish the action of pressing the ENTER key alone, you could do:

# echo "press ENTER \c";read LINE;[ -z "${LINE}" ] && echo OK || echo "Please just press ENTER"

Regards!

...JRF...

Re: Keyboard reading from ksh

Leo The Cat — Wed, 11 Feb 2009 15:39:42 GMT

Hi Guys

In fact, is there another keyboard function. (named readchar by example) I'd like to have only one striked key on input.

ENTER key was not the good example because source of confusion on my question. sorry.

Suppose you have choice between [Y]es or [N]o during execution script. If the user press Y or N it's enough to continue and ENTER is not necessary.

Is it possible ?

Thanks Guys and sorry again about the confusion.

Bests Regards
Den

Re: Keyboard reading from ksh

James R. Ferguson — Thu, 12 Feb 2009 02:23:38 GMT

Hi (again) Den:

Try this:

# cat ./readchar
#!/usr/bin/sh
echo "Enter character: \c"
stty raw
readchar=$(dd if=/dev/tty bs=1 count=1 2 > /dev/null)
stty -raw
echo "\nYou pressed the '${readchar}' key"
exit 0

Regards!

...JRF...

Re: Keyboard reading from ksh

Laurent Menase — Thu, 12 Feb 2009 05:22:57 GMT

if you want to be able to get any char

SAVstty=$(stty -g)
stty raw min 1 time 0
a="$(od -A n -c -N 1)
stty $SAVstty
echo $a

if you type a you will get \r
if you type a ^J you will get \n
a backspace \b
a tab \t
.....
if you replace -c in od command by -x then you get the ascii value in hex.

Re: Keyboard reading from ksh

Leo The Cat — Thu, 12 Feb 2009 15:52:33 GMT

Thanks Guys last two posts was very helpfull !

The final way to solve this small affair is:

echo -n "Enter a character: " # prompt
/bin/stty -icanon && /bin/stty eol ^A
key=`dd if=/dev/tty bs=1 count=1 2>/dev/null` # read a key press
/bin/stty icanon && /bin/stty eol ^@
echo "$key" # echo newline and/or key -- OPTIONAL

Bests Regards
Den