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Re: [Wlug] Bash help

by Theo Van Dinter

On Wed, Jul 17, 2002 at 08:47:35PM -0700, Tim Trachimowicz wrote: > I have a bunch of files on a server that are in the > format "filename_x.dat" and I need to rename them "filename.dat", i.e. > strip to last two characters off the filename while maintaining the > extension. Are they all "_x"? You could do something like: for i in *_x.*; do mv -f $i `echo $i | sed -e 's/_x././'`; done it would be more flexible to do in perl of course: opendir(T,".") || die "can't open dir:$!"; while($_=readdir(T)){ next unless ( -f $_ ); ($a,$b) = /^(.+)\.(.+)$/; next unless ( $a && $b ); $a =~ s/..$//; rename($_,"$a.$b"); } closedir(T); Warning: none of these have been tested, I just wrote them out so YMMV. -- Randomly Generated Tagline: "I'm at the age where food has taken the place of sex in my life. In fact, I've just had a mirror placed over my kitchen table." - Rodney Dangerfield

July 18, 2002

Re: [Wlug] Bash help

by Scott Venier

for i in * ; do mv $i `echo $i | sed 's/$.*$..\.$.*$/\1.\2/'` done Should do the trick... It moves each file to the original filename, minus the two characters before the last . As far as a book to get, _Learning the bash Shell, 2nd Edition_, published by o'reilly. Also likely useful _sed & awk, 2nd Edition_, also published by o'reilly. The sed book will translate that example of leaning toothpick syndrome. Scott On Wed, 17 Jul 2002, Tim Trachimowicz wrote: > Hey folks! > > I have a bunch of files on a server that are in the > format "filename_x.dat" and I need to rename them "filename.dat", i.e. > strip to last two characters off the filename while maintaining the > extension. > > If it wasn't for the fact that I have about 400 files in multiple > directories, I'd do it by hand. However, it's of a somewhat urgent > nature - hence this slightly off-topic cry for help! =) > > I'm pretty sure there's a way to do it via a shell script (I use bash) - > the only problem being that I've never written one before. Can anyone > point me to a faq/tutorial/website that might explain the process? If > it's a trivial task, anyone care to take a stab? Google gave me a few > leads, but most aren't helping a lot. > > Any help is appreciated! Thanks! > > --Tim > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug >

July 18, 2002

Bash help

by Tim Trachimowicz

Hey folks! I have a bunch of files on a server that are in the format "filename_x.dat" and I need to rename them "filename.dat", i.e. strip to last two characters off the filename while maintaining the extension. If it wasn't for the fact that I have about 400 files in multiple directories, I'd do it by hand. However, it's of a somewhat urgent nature - hence this slightly off-topic cry for help! =) I'm pretty sure there's a way to do it via a shell script (I use bash) - the only problem being that I've never written one before. Can anyone point me to a faq/tutorial/website that might explain the process? If it's a trivial task, anyone care to take a stab? Google gave me a few leads, but most aren't helping a lot. Any help is appreciated! Thanks! --Tim

July 18, 2002

Re: [Wlug] writing to tape

by Michael Frysinger

try to get rid of the O_TRUNC to see if it might help <from `man dd`> Often a tape drive will not accept arbitrarily sized blocks, and dd would get an I/O error for the last fragment of data that does not fill an entire block. Use `dd if=myfile of=/dev/mytape conv=sync' to get everything on tape. Of course, reading it back will now produce a slightly larger file, with nulls added at the end. </from `man dd`> -mike ----- Original Message ----- From: "Chuck Homic" <chuck(a)vvisions.com> To: <wlug(a)mail.wlug.org> Sent: Wednesday, July 17, 2002 8:46 PM Subject: Re: [Wlug] writing to tape > On Wed, Jul 17, 2002 at 08:36:16PM -0400, Brad Noyes wrote: > > This program will work with a file, and a floppy device, but not a tape > > device. > > > > can anyone give me some pointers? what do i have to do differently to > > write to tape? > > I've never used tape before, but I know tape is not quite as ambidextrous > as a file or floppy device. > > So, instead of O_RDWR | O_CREAT | O_TRUNC, I'd try a simple O_WRONLY. Or > other things. Maybe. > > -Chuck > _______________________________________________ > Wlug mailing list > Wlug(a)mail.wlug.org > http://mail.wlug.org/mailman/listinfo/wlug >

July 18, 2002

Re: [Wlug] writing to tape

by Chuck Homic

On Wed, Jul 17, 2002 at 08:36:16PM -0400, Brad Noyes wrote: > This program will work with a file, and a floppy device, but not a tape > device. > > can anyone give me some pointers? what do i have to do differently to > write to tape? I've never used tape before, but I know tape is not quite as ambidextrous as a file or floppy device. So, instead of O_RDWR | O_CREAT | O_TRUNC, I'd try a simple O_WRONLY. Or other things. Maybe. -Chuck

July 18, 2002

writing to tape

by Brad Noyes

Hi All, I trying to write a program that will write to tape, but i can't seem to get it to work correctly. i have attached a simple piece of source code that will open a file (or device) and write the string "hello, tape". This program will work with a file, and a floppy device, but not a tape device. can anyone give me some pointers? what do i have to do differently to write to tape? Thanks, --brad

July 18, 2002

Reminder: WLUG meeting July 17th (WEDNESDAY)

by Andy Stewart

HI everybody, This month's WLUG meeting will be held on Wednesday, July 17th in Kinnicutt Hall on the WPI campus at 7:00 PM. The topic will be "Wireless Networking" and I'm pretty sure we have a speaker. If you have a laptop with a wireless connection, bring it along. I'll bring my new Linksys access point (WAP11) and my laptop. Bring whatever you think will make this an interesting meeting! After the meeting, we'll make a trip to the Boynton Restaurant for pizza and beer. I hope to see you there! Andy -- Andy Stewart, Founder Worcester Linux Users' Group Worcester, MA USA http://www.wlug.org

July 16, 2002

Re: [Wlug] interesting problem

by Theo Van Dinter

On Mon, Jul 15, 2002 at 08:57:20PM -0400, Wesley Allen wrote: > Shortly after I started using a wireless lan, I began having problems > with connecting to my local ip addresses; I'm not sure what's causing > it. Internet works FINE, and yet, a couple of minutes after I boot my > machine I can't connect to anything in the 192.168 range! It doesn't > matter the protocol, smb, http, etc. no connections at all. What's > stranger is that my win4lin install, which uses vnet, has no problems at > all. What in the world is going on here? Any thoughts? If this were a Sun box, I'd blame gated, which is the arch nemesis of all that is good and decent. ;) On a related note, the first thing I would look at is the routing table (netstat -nr), and make sure you have a route for that network. I would then check on the network interface and make sure it's passing packets (do a tcpdump or your favorite packet sniffer). -- Randomly Generated Tagline: "If you want a completely predictable and static environment, learn VMS." - Ed Taylor

July 16, 2002

interesting problem

by Wesley Allen

Shortly after I started using a wireless lan, I began having problems with connecting to my local ip addresses; I'm not sure what's causing it. Internet works FINE, and yet, a couple of minutes after I boot my machine I can't connect to anything in the 192.168 range! It doesn't matter the protocol, smb, http, etc. no connections at all. What's stranger is that my win4lin install, which uses vnet, has no problems at all. What in the world is going on here? Any thoughts? Wes

July 16, 2002

Lexmark z22 printing

by Bill Smith

Printing fun... Some of you might already know what I have to say, but I wanted to get this out for those that are in my boat... I am running a Gateway Solo 9100 laptop with Red Hat 7.3 installed. I mentioned a few months back (almost a year ago, now) that I had gotten my Lexmark z22 to print with Red Hat 7.1. One thing that I hate about upgrading RH versions is that it invariably forces me to re-learn things, since Red Hat can't seem to leave current configurations alone. 8\ ANYWAY, for a bunch of Stupid Reasons, I decided that I wanted to make use of the USB port on my z22 instead of the parallel port. Imagine, if you will, the fun I had in trying to get a printer that is barely supported by Linux to be recognized on the USB interface... I went to Lexmark's website and got the Linux drivers. Wouldn't you know it, though, but the drivers make no effort whatsoever to support the USB interface on the printer! After a bit of poking around, I realized that there was a KDE Control Panel! I use Window Maker by default and I was annoyed that control-panel was removed. I went through there and LO! the Lexmark z22 is there, right on the USB interface! 8) Granted, there are a couple snags. It looks like I can print multiple text-only documents with no problem, but if I print a Postscript file, then I have to turn the printer off then turn it on again. Compared to having no printer at all (or worse-yet, having to print from WinDOZE!), I see this as only a minor inconvenience. I'm thinking that this rig is using the foomatic configuration scripts, which may be unacceptable to some. I base this thought on the fact that the driver in use is actually for the Lexmark 3200 series, which (according to the .xml file) may print "a bit too rich"... <shrug> It looks okay for the black text that I'm printing with right now. I just wanted to share what I came across. Any corrections/suggestions are appreciated. (Yes, I went to http://www.linuxprinting.org ...) Best regards, -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- William Smith wsmith-at-chezsmith-dot-com Fall River, MA http://www.chezsmith.com "On the one hand, we'll never experience childbirth. On the other hand, we can open all our own jars." -- Jeff Green, on the difference between men and women * TAG! v3.0 *

July 15, 2002