bug#21908: find -f breaks pipes ?
Flemming Gulager Danielsen wrote: > I am new here so if this is not the proper use of the maillist then > I am sorry. Others answered your output buffering question. Let me address the mailing list question. When you send a message to bug-coreutils it opens a bug ticket so that we can track bugs and they won't get lost. When asking a question such as you are doing it is better to use the coreutils@gnu.org mailing list instead. That is a normal mailing list just for discussion and no bug tickets opened. It is the better place for questions and discussion. Bob
bug#21908: find -f breaks pipes ?
On 11/13/2015 06:17 PM, Pádraig Brady wrote: > You can change the buffering with stdbuf. For e.g.: > > tail -f testfile | stdbuf -oL tr -d H | grep e Additionally, depending on whether you furtherly process the output, e.g. with yet another "| grep .", you see that grep also uses some output buffering, so you may end up with: tail -f testfile \ | stdbuf -oL tr -d H \ | grep --line-buffered e \ | grep . Have a nice day, Berny
bug#21908: find -f breaks pipes ?
Hi Guyz!
I am new here so if this is not the proper use of the maillist then I am sorry.
I normally think I know my way around shells, but this I cant get the below to
work. And I am wondering if it is a bug I need to report on tail util.
I run this command on a file.
tail -f testfile | tr -d H | grep e
while I in another shell
echo "Testing" >> testfile.
If leave out "| grep e" I get the output. I have tried with xargs echo {} also,
but I get nothing if I go beond 2 pipes. It works fine if I go through a while
read loop.
---
Med venlig hilsen / best regards
Flemming Danielsen
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bug#21908: find -f breaks pipes ?
tag 21908 notabug
close 21908
stop
On 13/11/15 14:20, Flemming Gulager Danielsen wrote:
> Hi Guyz!
>
> I am new here so if this is not the proper use of the maillist then I am
> sorry. I normally think I know my way around shells, but this I cant get the
> below to work. And I am wondering if it is a bug I need to report on tail
> util.
>
> I run this command on a file.
>
> tail -f testfile | tr -d H | grep e
>
> while I in another shell
>
> echo “Testing” >> testfile.
>
> If leave out “| grep e” I get the output. I have tried with xargs echo {}
> also, but I get nothing if I go beond 2 pipes. It works fine if I go through
> a while read loop.
The data is buffered as detailed at:
http://www.pixelbeat.org/programming/stdio_buffering/
You can change the buffering with stdbuf. For e.g.:
tail -f testfile | stdbuf -oL tr -d H | grep e
cheers,
Pádraig.
