I've shell loop in which I display 10 lines of the file at a time.
I've code line as follows to pause user:
---- My bash under GNU/Linux loop code ---
while read l
do
if [ $c -eq 10 ]
then
c=1 # reset
echo " *** Press [Enter] key to continue ..."
read anyDamkey
fi
echo $l
(( c++ ))
done < $input


I only see message *** Press [Enter] key to continue ... and read
command skips and loop continue while end of file. It appears that \n
from previous echo $line is feeding read command. In others word I'd
like to flush buffer and wait for pause prompt. How do I fix this. I
spend 4 hours but with no luck

~~~~~~~
My output
-----------
line 1 to 10
*** Press [Enter] key to continue .. <--- not wating for use input
line 11 to 20
*** Press [Enter] key to continue .. <--- not wating for use input
line 11 to N



TIA

Fox

On 2008-04-21, Fox <fox@foxmail.in> wrote:
>
>
> I've shell loop in which I display 10 lines of the file at a time.
> I've code line as follows to pause user:
> ---- My bash under GNU/Linux loop code ---
> while read l
> do
> if [ $c -eq 10 ]
> then
> c=1 # reset
> echo " *** Press [Enter] key to continue ..."
> read anyDamkey
> fi
> echo $l
> (( c++ ))
> done < $input
>
>
> I only see message *** Press [Enter] key to continue ... and read
> command skips and loop continue while end of file. It appears that \n
> from previous echo $line is feeding read command. In others word I'd
> like to flush buffer and wait for pause prompt. How do I fix this. I
> spend 4 hours but with no luck
>
By default the read command reads from standard input, which you have
redirected.
Possible solutions are:
read anyDamkey </dev/tty
read anyDamkey <&2

exec 3<&0
while read l
....
read anyDamkey <&3
....
done <$input

exec 3<$input
while read l
....
done <&3

2008-04-21, 02:55(-04), Barry Margolin:
[...]
> exec 3<&0
> while read l
> do
> ...
> read -u 3 anyDamkey
> ...
> done < $input
[...]

Or, more logically to my mind:

while read <&3 l; do
...
read anyDamLine
...
done 3< "$input"

Note that -u 3 is a ksh extension also found in bash and zsh, I
don't really see the advantage over the standard <&3 (other than
it allows for fds over 9).

--
Stéphane

thank for all your input it was really hard to find out the
solution just reading man pages.

On 2008-04-21, Fox <fox@foxmail.in> wrote:
> I've shell loop in which I display 10 lines of the file at a time.
> I've code line as follows to pause user:
> ---- My bash under GNU/Linux loop code ---
> while read l
> do
> if [ $c -eq 10 ]
> then
> c=1 # reset
> echo " *** Press [Enter] key to continue ..."
> read anyDamkey
> fi
> echo $l
> (( c++ ))
> done < $input
>
>
> I only see message *** Press [Enter] key to continue ... and read
> command skips and loop continue while end of file. It appears that \n
> from previous echo $line is feeding read command. In others word I'd
> like to flush buffer and wait for pause prompt. How do I fix this. I
> spend 4 hours but with no luck
>
> ~~~~~~~
> My output
> -----------
> line 1 to 10
> *** Press [Enter] key to continue .. <--- not wating for use input
> line 11 to 20
> *** Press [Enter] key to continue .. <--- not wating for use input
> line 11 to N
>
>
>
> TIA
>
> Fox

Question...where is "read anyDamnkey" getting its data from?

Hint: What difference is there between "read l" and "read anyDamnkey"?


--
Christopher Mattern

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