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Re: 100% cpu with: while true ;do read < /dev/null ;done
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From: |
Marc Herbert |
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Subject: |
Re: 100% cpu with: while true ;do read < /dev/null ;done |
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Date: |
Fri, 23 Oct 2009 09:09:14 +0100 |
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User-agent: |
Thunderbird 2.0.0.21 (X11/20090320) |
Jo King a écrit :
>> thanks for reply. agree it's not a
>> bug with bash.
>>
>> i am inclinded to agree with the comments but bash is
>> popular and attracts a lot of newbies into scripting - a bit
>> of smart 'correction' of their wrong ways would at least
>> keep the cpu available for other processes (even a sleep for
>> 100ms would make a huge difference).
"Newbies" should just stay clear from developing any advanced shell
script. There is way too much rope too hang themselves and your example
is just one among many other ways. There is plenty other, newer
programming environments that are far easier and safer to play with and
learn.
By the way the same hold for configuring firewalls. It becomes even
worse when it relates to security. ("Security by newbies"... ahem,
really?)
Cheers,
Marc