Re: cat command with timeout
On Sun, Jun 20, 2010 at 04:06:51PM +0300, Raz wrote: > watch -n1 cat lala > is another possiblity What for? This re-runs cat 1 second after it has finished running. Try: watch -n1 'sleep 5; echo hi' It will refresh the display every 6 seconds. -- Tzafrir Cohen | tzaf...@jabber.org | VIM is http://tzafrir.org.il || a Mutt's tzaf...@cohens.org.il || best tzaf...@debian.org|| friend ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: cat command with timeout
watch -n1 cat lala is another possiblity 2010/6/20 Yigal Asnis > You can use timeout command, like > timeout 5 cat ... > Yigal > > --- On *Sat, 6/19/10, Dan Bar Dov * wrote: > > > From: Dan Bar Dov > Subject: Re: cat command with timeout > To: "Ori Idan" > Cc: "IGLU Mailing list" > Date: Saturday, June 19, 2010, 11:03 PM > > Years ago I needed a cat with a timeout argument. > I modified the cat code. It was very easy (if I remember correctly less > than one hour of work). > > Sadly, I don't have the code. > > Good luck. > Dan > > 2010/6/10 Ori Idan > http://mc/compose?to=...@helicontech.co.il> > > > >> I have to read lines from serial port, I thought to read them using 'cat' >> however, since the other unit connected to the serial port, might >> malfunction and not send anything, I need a timeout to stop reading after >> few seconds. >> Does someone know of an alternative to cat with timeout? >> >> -- >> Ori Idan >> >> >> >> ___ >> Linux-il mailing list >> Linux-il@cs.huji.ac.il <http://mc/compose?to=linux...@cs.huji.ac.il> >> http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il >> >> > > -Inline Attachment Follows- > > > ___ > Linux-il mailing list > Linux-il@cs.huji.ac.il <http://mc/compose?to=linux...@cs.huji.ac.il> > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > > > > ___ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > > ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: cat command with timeout
You can use timeout command, like timeout 5 cat ... Yigal --- On Sat, 6/19/10, Dan Bar Dov wrote: From: Dan Bar Dov Subject: Re: cat command with timeout To: "Ori Idan" Cc: "IGLU Mailing list" Date: Saturday, June 19, 2010, 11:03 PM Years ago I needed a cat with a timeout argument.I modified the cat code. It was very easy (if I remember correctly less than one hour of work). Sadly, I don't have the code. Good luck.Dan 2010/6/10 Ori Idan I have to read lines from serial port, I thought to read them using 'cat' however, since the other unit connected to the serial port, might malfunction and not send anything, I need a timeout to stop reading after few seconds. Does someone know of an alternative to cat with timeout? -- Ori Idan ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il -Inline Attachment Follows- ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: cat command with timeout
Years ago I needed a cat with a timeout argument. I modified the cat code. It was very easy (if I remember correctly less than one hour of work). Sadly, I don't have the code. Good luck. Dan 2010/6/10 Ori Idan > I have to read lines from serial port, I thought to read them using 'cat' > however, since the other unit connected to the serial port, might > malfunction and not send anything, I need a timeout to stop reading after > few seconds. > Does someone know of an alternative to cat with timeout? > > -- > Ori Idan > > > > ___ > Linux-il mailing list > Linux-il@cs.huji.ac.il > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > > ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: cat command with timeout
On Thu, Jun 10, 2010, Ori Idan wrote about "cat command with timeout": > I have to read lines from serial port, I thought to read them using 'cat' > however, since the other unit connected to the serial port, might > malfunction and not send anything, I need a timeout to stop reading after > few seconds. > Does someone know of an alternative to cat with timeout? It sounds like (but correct me if I'm wrong) that what you're looking for is't "cat", but rather a way to read a single line in a shell-script, but give up after a timeout when you didn't get any line. The command for this is "read", and bash has a -t parameter: read -t 4 line reads a single line from the standard input (redirect it with "<" from the serial port, if you want) into the variable $line, but if in 4 seconds it doesn't get a line, it gives up. If you really want cat with a timeout, you can simulate one with a script. For example (I did *not* test this): #!/bin/sh cat /dev/... & pid=$! sleep 5 kill $pid But I'm not sure how exactly this makes sense (when reading from the serial port, basically cat will never finish, and will always be killed exactly after 5 seconds - even if a line appeared after just 1 second). -- Nadav Har'El| Thursday, Jun 10 2010, 28 Sivan 5770 n...@math.technion.ac.il |- Phone +972-523-790466, ICQ 13349191 |Time is the best teacher. Unfortunately http://nadav.harel.org.il |it kills all its students. ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
Re: cat command with timeout
cat /dev/your_serial_port > some_file &sleep Xkill $! Valery --- On Thu, 6/10/10, Ori Idan wrote: From: Ori Idan Subject: cat command with timeout To: "IGLU Mailing list" Date: Thursday, June 10, 2010, 10:13 AM I have to read lines from serial port, I thought to read them using 'cat' however, since the other unit connected to the serial port, might malfunction and not send anything, I need a timeout to stop reading after few seconds. Does someone know of an alternative to cat with timeout? -- Ori Idan -Inline Attachment Follows- ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
cat command with timeout
I have to read lines from serial port, I thought to read them using 'cat' however, since the other unit connected to the serial port, might malfunction and not send anything, I need a timeout to stop reading after few seconds. Does someone know of an alternative to cat with timeout? -- Ori Idan ___ Linux-il mailing list Linux-il@cs.huji.ac.il http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il
