Re: [OFF-TOPIC] Re: Simple Unix utility?
Lorens Kockum [EMAIL PROTECTED] writes: NONDEBIANPOST On Sun, Dec 07, 1997 at 12:31:23PM +0100, Torsten Hilbrich wrote: cut doesn't buffers everything, grep is to blame. If grep output to a non-terminal (e.g. a pipe) it use buffers of 4k (don't remember the correct value). Unfortunatly, I don't know any way to get around this. If that's the problem, then do tail -f file | cut -b whatever | grep whatever and presto, you're outputting to a terminal. Won't work, of course, if cut has the same problem. Of course. I assume that almost any utility block buffers the output if not going to the terminal. This will happen if you have more than one pipe in your command line. Torsten -- I haven't lost my mind -- it's backed up on tape somewhere. Fortune Cookie PGP Public key available -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
[OFF-TOPIC] Re: Simple Unix utility?
NONDEBIANPOST On Sun, Dec 07, 1997 at 12:31:23PM +0100, Torsten Hilbrich wrote: cut doesn't buffers everything, grep is to blame. If grep output to a non-terminal (e.g. a pipe) it use buffers of 4k (don't remember the correct value). Unfortunatly, I don't know any way to get around this. If that's the problem, then do tail -f file | cut -b whatever | grep whatever and presto, you're outputting to a terminal. Won't work, of course, if cut has the same problem. /NONDEBIANPOST -- include std_disclaim.h Lorens KOCKUM ( [EMAIL PROTECTED] ) -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
Re: Simple Unix utility?
Jim Pick [EMAIL PROTECTED] writes: Now I notice that cut seems to buffer everything up. $ tail -f /opt/linuxhq/livesite/var/log/access.log | grep -v gif | cut -c1-175 Is there another way around that? cut doesn't buffers everything, grep is to blame. If grep output to a non-terminal (e.g. a pipe) it use buffers of 4k (don't remember the correct value). Unfortunatly, I don't know any way to get around this. Maybe you can use awk (or perl) to combine the functionality of grep and cut in the above line. BTW: A parameter to every program enforcing line-buffering instead of block-buffering would be great. In this case grep would be called with this parameter and everything works fine again. Torsten -- I haven't lost my mind -- it's backed up on tape somewhere. Fortune Cookie PGP Public key available -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
Simple Unix utility?
Hi, One task I do commonly is monitor my system log files using 'tail -f'. I was wondering if there was a commonly used method for doing the same thing, but filtering it at the same time. For example, I like to view the logs on the LinuxHQ website as they are being generated, but I don't care about gif's and jpeg's, or accesses from my domain. So I end up using something like this (in a wide xterm): $ watch -n 10 'tail -100 /opt/linuxhq/livesite/var/log/access.log | grep -v gif|jpg|jimpick\.com | tail -20 | cut -c1-175' It works - but it obviously isn't the most efficient way of doing this. I was wondering if there was a Unix utility I may have overlooked that does the same sort of thing. I know I could probably write a Perl script to do the same thing - but it seems like a general enough problem that there is probably something that handles it already. Cheers, - Jim pgpt6uBz78hgF.pgp Description: PGP signature
Re: Simple Unix utility?
On 5 Dec 1997, Jim Pick wrote: One task I do commonly is monitor my system log files using 'tail -f'. I was wondering if there was a commonly used method for doing the same thing, but filtering it at the same time. For example, I like to view the logs on the LinuxHQ website as they are being generated, but I don't care about gif's and jpeg's, or accesses from my domain. So I end up using something like this (in a wide xterm): $ watch -n 10 'tail -100 /opt/linuxhq/livesite/var/log/access.log | grep -v gif|jpg|jimpick\.com | tail -20 | cut -c1-175' It works - but it obviously isn't the most efficient way of doing this. I was wondering if there was a Unix utility I may have overlooked that does the same sort of thing. I know I could probably write a Perl script to do the same thing - but it seems like a general enough problem that there is probably something that handles it already. Umm, you had the right idea when using tail -f. Try tail -f file | grep pattern -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
Re: Simple Unix utility?
Scott K. Ellis [EMAIL PROTECTED] writes: I was wondering if there was a commonly used method for doing the same thing, but filtering it at the same time. Umm, you had the right idea when using tail -f. Try tail -f file | grep pattern For some dumb reason, I didn't think I could do a pipe out of tail -f. Boy, do I feel stupid. :-) Now I notice that cut seems to buffer everything up. $ tail -f /opt/linuxhq/livesite/var/log/access.log | grep -v gif | cut -c1-175 Is there another way around that? Cheers, - Jim pgp8Wj1dIIKbn.pgp Description: PGP signature
Re: Simple Unix utility?
Jim Pick wrote: Now I notice that cut seems to buffer everything up. $ tail -f /opt/linuxhq/livesite/var/log/access.log | grep -v gif | cut -c1-175 Is there another way around that? Assumming you're using apache, why not set up a custom log file that has the format you want, so you don't have to use cut. -- see shy jo pgpSIdU3nTEYC.pgp Description: PGP signature
Re: Simple Unix utility?
Now I notice that cut seems to buffer everything up. You should file a bug against cut, it should do line buffering when output is a tty. -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
Re: Simple Unix utility?
On Sat, 6 Dec 1997, [iso-8859-1] Nicolás Lichtmaier wrote: Now I notice that cut seems to buffer everything up. You should file a bug against cut, it should do line buffering when output is a tty. It may be something in the middle of the pipe doing the buffering. Not certain how to handle that case. -- TO UNSUBSCRIBE FROM THIS MAILING LIST: e-mail the word unsubscribe to [EMAIL PROTECTED] . Trouble? e-mail to [EMAIL PROTECTED] .
Re: Simple Unix utility?
Scott K. Ellis [EMAIL PROTECTED] writes: On Sat, 6 Dec 1997, [iso-8859-1] Nicolás Lichtmaier wrote: Now I notice that cut seems to buffer everything up. You should file a bug against cut, it should do line buffering when output is a tty. It may be something in the middle of the pipe doing the buffering. Not certain how to handle that case. Yes, that's the case - I had grep in the pipe before cut. ie. tail -f var/log/access.log | grep -v 'gif' | cut -c1-150 Maybe I'll just use a little perl script (with $|=1) to do the filtering I want - that's probably easiest. Cheers, - Jim pgpFR3u3X4EvB.pgp Description: PGP signature
