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From: superpollo on 21 May 2010 12:07
Ed Morton ha scritto:
> On 5/21/2010 9:43 AM, superpollo wrote:
>> Ben Finney ha scritto:
>>> superpollo <utente(a)esempio.net> writes:
>>>
>>>> is it possible to crete a "text file" such that it has a different
>>>> content each time it is opened?
>>>
>>> Not as a text file.
>>>
>>> Two existing patterns that I can think of:
>>>
>>> * Write a program to generate the output. Run that program.
>>>
>>> * Write a program to generate the output on a named pipe (see the Linux
>>> man page 'fifo(7)', or any Unix documentation about FIFOs). Run that
>>> program. Read the named pipe when you want the output.
>>>
>>
>> ok, i tried this:
>>
>>
>> $ cat fifo.sh
>> #!/usr/bin/env bash
>> [ -p "numbers" ] || mkfifo "numbers"
>> for i in $(seq 1 1 10)
>> do
>> echo $i >> numbers
>> done
>> $ ./fifo.sh &
>> [1] 7946
>> $ cat numbers
>> 1
>> 2
>> 3
>> 4
>> 5
>> 6
>> 7
>> 8
>> 9
>> 10
>> [1]+ Done ./fifo.sh
>> $
>>
>> but i expecter something like:
>>
>> $ cat numbers
>> 1
>> $ cat numbers
>> 2
>> $ cat numbers
>> 3
>> ...
>
> change ">>" to ">"

~/superpollo$ cat fifo.sh
#!/usr/bin/env bash
[ -p "numbers" ] || mkfifo "numbers"
for i in $(seq 1 1 10)
do
echo $i > numbers
done
~/superpollo$ ./fifo.sh &
[1] 8989
~/superpollo$ cat numbers
1
2
3
4
5
6
7
8
9
10
[1]+ Done ./fifo.sh
~/superpollo$
From: Bill Marcum on 21 May 2010 12:26
On 2010-05-21, superpollo <utente(a)esempio.net> wrote:
> Ed Morton ha scritto:
>>> but i expecter something like:
>>>
>>> $ cat numbers
>>> 1
>>> $ cat numbers
>>> 2
>>> $ cat numbers
>>> 3
>>> ...
>>
>> change ">>" to ">"
>
> ~/superpollo$ cat fifo.sh
> #!/usr/bin/env bash
> [ -p "numbers" ] || mkfifo "numbers"
> for i in $(seq 1 1 10)
> do
> echo $i > numbers
> done
> ~/superpollo$ ./fifo.sh &
> [1] 8989
> ~/superpollo$ cat numbers
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> 10
> [1]+ Done ./fifo.sh
> ~/superpollo$

for i in $(seq 1 10)
do
echo $i > numbers
sleep 1
done

From: superpollo on 21 May 2010 14:02
Bill Marcum ha scritto:
> On 2010-05-21, superpollo <utente(a)esempio.net> wrote:
>> Ed Morton ha scritto:
>>>> but i expecter something like:
>>>>
>>>> $ cat numbers
>>>> 1
>>>> $ cat numbers
>>>> 2
>>>> $ cat numbers
>>>> 3
>>>> ...
>>> change ">>" to ">"
>> ~/superpollo$ cat fifo.sh
>> #!/usr/bin/env bash
>> [ -p "numbers" ] || mkfifo "numbers"
>> for i in $(seq 1 1 10)
>> do
>> echo $i > numbers
>> done
>> ~/superpollo$ ./fifo.sh &
>> [1] 8989
>> ~/superpollo$ cat numbers
>> 1
>> 2
>> 3
>> 4
>> 5
>> 6
>> 7
>> 8
>> 9
>> 10
>> [1]+ Done ./fifo.sh
>> ~/superpollo$
>
> for i in $(seq 1 10)
> do
> echo $i > numbers
> sleep 1
> done
>

thanks!



--
chiedo scusa a chi e' offeso.
il mio era un messaggio bonario.
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