Re: [SLUG] tailing, following and filtering

2006-11-24 Thread Penedo
On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: On Thu, Nov 23, 2006 at 05:10:14PM +1100, Penedo wrote: > On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: > >You don't get the output in as timely a fashion; > >it comes with spurts as the buffer is filled up > >then written out. >

Re: [SLUG] tailing, following and filtering

2006-11-24 Thread Penedo
On 23/11/06, Michael Chesterton <[EMAIL PROTECTED]> wrote: I guess grep is detecting whether it's talking to a terminal, and doesn't buffer if it is (or probably line buffers). There is no need to guess here - it's standard stdio behaviour (from stdio(3)): When opened, the standard error strea

Re: [SLUG] tailing, following and filtering

2006-11-23 Thread Sam Lawrance
On 23/11/2006, at 7:19 PM, Erik de Castro Lopo wrote: Michael Chesterton wrote: I guess grep is detecting whether it's talking to a terminal, and doesn't buffer if it is (or probably line buffers). If you are using whatever | grep one | grep two the first grep will detect that i

Re: [SLUG] tailing, following and filtering

2006-11-23 Thread Erik de Castro Lopo
Michael Chesterton wrote: > I guess grep is detecting whether it's talking to a terminal, and doesn't > buffer if it is (or probably line buffers). If you are using whatever | grep one | grep two the first grep will detect that it is reading from a pipe and writing to a pipe and will b

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Michael Chesterton
Matthew Hannigan <[EMAIL PROTECTED]> writes: > Weird. > > With --line-buffered on the first grep I get it continuous. > If only the second grep is --line-buffered, then it goes spurty again. > That points to the first grep buffering by default, to me. I guess grep is detecting whether it's talkin

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Matthew Hannigan
On Thu, Nov 23, 2006 at 05:10:14PM +1100, Penedo wrote: > On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: > >You don't get the output in as timely a fashion; > >it comes with spurts as the buffer is filled up > >then written out. > > What buffer? tail's manual doesn't mention anything abo

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Penedo
On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: You don't get the output in as timely a fashion; it comes with spurts as the buffer is filled up then written out. What buffer? tail's manual doesn't mention anything about buffers but my experience is that you get individual lines even t

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Matthew Hannigan
On Thu, Nov 23, 2006 at 03:28:24PM +1100, Zhasper wrote: > On 11/23/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: > >On Thu, Nov 23, 2006 at 01:30:50PM +1100, Penedo wrote: > >> On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: > >> >On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote:

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Zhasper
On 11/23/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: On Thu, Nov 23, 2006 at 01:30:50PM +1100, Penedo wrote: > On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: > >On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: > >> On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: > >> >

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Matthew Hannigan
On Thu, Nov 23, 2006 at 01:30:50PM +1100, Penedo wrote: > On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: > >On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: > >> On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: > >> >I want to tail -f the syslog file but I only want to see wh

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Penedo
On 23/11/06, Daniel Bush <[EMAIL PROTECTED]> wrote: Not sure about the 'less -F'. In my version '-F' is different to 'F' Sorry, I meant "+F" (i.e. treat the "F" as if the user typed it interactively while "inside" less, another useful command is "+G"). - the latter being pressed after less i

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Daniel Bush
On 23/11/06, Penedo <[EMAIL PROTECTED]> wrote: On 23/11/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > tail -f /var/log/syslog |grep something |grep -v but-not-this |less Make it "| less -F +/re-to-highlight" so you can always ^C to scroll back through the output then type "F" again to get b

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Penedo
On 23/11/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: tail -f /var/log/syslog |grep something |grep -v but-not-this |less Make it "| less -F +/re-to-highlight" so you can always ^C to scroll back through the output then type "F" again to get back to the bottom and tail from there. A wry

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread jam
On Thursday 23 November 2006 10:33, [EMAIL PROTECTED] wrote: > > On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: > > > On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: > > > >I want to tail -f the syslog file but I only want to see what I want > > > > to see and I don't want to see wh

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Zhasper
On 11/23/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: > On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: > >I want to tail -f the syslog file but I only want to see what I want to > >see and I don't want to see what I don't what to

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Penedo
On 23/11/06, Matthew Hannigan <[EMAIL PROTECTED]> wrote: On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: > On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: > >I want to tail -f the syslog file but I only want to see what I want to > >see and I don't want to see what I don't what to

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Daniel Bush
On 23/11/06, Craig Dibble <[EMAIL PROTECTED]> wrote: Matthew Hannigan wrote: > On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: >> What's wrong with "tail -f syslog | grep ..."? > > Buffering > more or less less is better than more -- SLUG - Sydney Linux User's Group Mailing List - ht

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Craig Dibble
Matthew Hannigan wrote: On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: What's wrong with "tail -f syslog | grep ..."? Buffering more or less -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.ht

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Matthew Hannigan
On Thu, Nov 23, 2006 at 08:23:37AM +1100, Penedo wrote: > On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: > >I want to tail -f the syslog file but I only want to see what I want to > >see and I don't want to see what I don't what to see. The idea is to > >tail follow through a filter. Is t

RE: [SLUG] tailing, following and filtering

2006-11-22 Thread Visser, Martin
AIL PROTECTED] On Behalf Of Penedo Sent: Thursday, 23 November 2006 8:24 AM To: SLUG Subject: Re: [SLUG] tailing, following and filtering On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: > I want to tail -f the syslog file but I only want to see what I want > to see and I don

Re: [SLUG] tailing, following and filtering

2006-11-22 Thread Penedo
On 23/11/06, Howard Lowndes <[EMAIL PROTECTED]> wrote: I want to tail -f the syslog file but I only want to see what I want to see and I don't want to see what I don't what to see. The idea is to tail follow through a filter. Is that possible. What's wrong with "tail -f syslog | grep ..."? -