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bug#21908: find -f breaks pipes ?
From: |
Pádraig Brady |
Subject: |
bug#21908: find -f breaks pipes ? |
Date: |
Fri, 13 Nov 2015 17:17:14 +0000 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
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.