Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
On 2007-10-22 Juri Mianovich wrote: I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d ' ' -` I don't know if any simpler way is possible (anyone?). Bahman ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
Bahman M. [EMAIL PROTECTED] wrote:
On 2007-10-22 Juri Mianovich wrote:
I am used to using this command in Linux, using GNU
dd:
dd if=/blah of=/bleh oflag=append conv=notrunc
The problem is, FreeBSD 'dd' does not understand the
oflag argument.
Is there some equivalent in the FreeBSD 'dd' syntax
that I can use, or am I forced to install GNU utils ?
Of course, the easiest way is to do this:
$ dd if=/blah /bleh
If you cannot do that, please explain why. If you know
your reason, there might be an alternative way to do it.
dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d ' ' -`
I don't know if any simpler way is possible (anyone?).
$ dd if=/blah of=/bleh conv=notrunc seek=$(stat -f%z /bleh)
I suggest to write a small alias or shell function if
you need to use such commands often. The following
shell function (for sh, zsh or bash) will do:
ddappend()
{
dd if=$1 of=$2 conv=notrunc seek=$(stat -f%z -- $2)
}
Then you can simply write: $ ddappend /blah /bleh
Best regards
Oliver
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Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
On Tue, 23 Oct 2007 16:42:46 +0330 Bahman M. [EMAIL PROTECTED] wrote: On 2007-10-22 Juri Mianovich wrote: I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d ' ' -` I don't know if any simpler way is possible (anyone?). is it any different to dd if=/blah /bleh ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
In the last episode (Oct 23), Oliver Fromme said: Bahman M. [EMAIL PROTECTED] wrote: On 2007-10-22 Juri Mianovich wrote: I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? Of course, the easiest way is to do this: $ dd if=/blah /bleh If you cannot do that, please explain why. If you know your reason, there might be an alternative way to do it. dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d ' ' -` I don't know if any simpler way is possible (anyone?). $ dd if=/blah of=/bleh conv=notrunc seek=$(stat -f%z /bleh) I don't think that will work, since seek's argument is in blocks. Even if you divide by 512 (or whatever you decide to set bs=), if the file you're appending do isn't a multiple of the blocksize, you'll end up chopping part of the end off. -- Dan Nelson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
On 2007-10-23 Dan Nelson wrote: In the last episode (Oct 23), Oliver Fromme said: Bahman M. [EMAIL PROTECTED] wrote: On 2007-10-22 Juri Mianovich wrote: I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? Of course, the easiest way is to do this: $ dd if=/blah /bleh If you cannot do that, please explain why. If you know your reason, there might be an alternative way to do it. dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d ' ' -` I don't know if any simpler way is possible (anyone?). $ dd if=/blah of=/bleh conv=notrunc seek=$(stat -f%z /bleh) I don't think that will work, since seek's argument is in blocks. Even if you divide by 512 (or whatever you decide to set bs=), if the file you're appending do isn't a multiple of the blocksize, you'll end up chopping part of the end off. Good point! The following should cover that: sh$ dd if=/blah of=/bleh conv=notrunc bs=1 seek=$(stat -f%z /bleh) or tcsh% dd if=/blah of=/bleh conv=notrunc bs=1 seek=`stat -f%z /bleh` I wonder if bs=1 can cause any slow down when working with large files? Bahman ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
Dan Nelson wrote: Oliver Fromme wrote: Of course, the easiest way is to do this: $ dd if=/blah /bleh I still think the OP should prefer that solution. If you cannot do that, please explain why. If you know your reason, there might be an alternative way to do it. dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d ' ' -` I don't know if any simpler way is possible (anyone?). $ dd if=/blah of=/bleh conv=notrunc seek=$(stat -f%z /bleh) I don't think that will work, since seek's argument is in blocks. Oops, you're right. I forgot about that. Even if you divide by 512 (or whatever you decide to set bs=), if the file you're appending do isn't a multiple of the blocksize, you'll end up chopping part of the end off. I wonder how GNU dd's append oflag behaves in that case. It would also either have to chop some bytes off the end, or leave a gap of zeros. Either way could be emulated. $ dd if=/blah of=/bleh conv=notrunc seek=$(( $(stat -f%z /bleh) / 512 )) That one would chop some bytes of the end if the file size isn't a multiple of 512 (the default block size). To leave a gap in that case, use this formula: $ ... seek=$(( ($(stat -f%z /bleh) + 511) / 512 )) Best regards Oliver -- Oliver Fromme, secnetix GmbH Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd Emacs ist für mich kein Editor. Für mich ist das genau das gleiche, als wenn ich nach einem Fahrrad (für die Sonntagbrötchen) frage und einen pangalaktischen Raumkreuzer mit 10 km Gesamtlänge bekomme. Ich weiß nicht, was ich damit soll. -- Frank Klemm, de.comp.os.unix.discussion ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
On 2007-10-23 RW wrote: On Tue, 23 Oct 2007 16:42:46 +0330 Bahman M. [EMAIL PROTECTED] wrote: On 2007-10-22 Juri Mianovich wrote: I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? dd if=/blah of=/bleh conv=notrunc seek=`ls -s /bleh | cut -f1 -d ' ' -` I don't know if any simpler way is possible (anyone?). is it any different to dd if=/blah /bleh Not at all. But as OP is trying to avoid 'cat /blah /bleh' I assumed that he also wouldn't want the shell to append the data to /bleh; I may be wrong though. Bahman ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
oflag option in GNU dd - equivalent in FreeBSD dd ?
I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
In the last episode (Oct 22), Juri Mianovich said: I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? Why not cat /blah /bleh ? dd is usually used on raw device nodes, and appending doesn't make sense there. -- Dan Nelson [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: oflag option in GNU dd - equivalent in FreeBSD dd ?
--- Dan Nelson [EMAIL PROTECTED] wrote: In the last episode (Oct 22), Juri Mianovich said: I am used to using this command in Linux, using GNU dd: dd if=/blah of=/bleh oflag=append conv=notrunc The problem is, FreeBSD 'dd' does not understand the oflag argument. Is there some equivalent in the FreeBSD 'dd' syntax that I can use, or am I forced to install GNU utils ? Why not cat /blah /bleh ? dd is usually used on raw device nodes, and appending doesn't make sense there. I have a long, boring (but good) reason that I can't use 'cat'. I need to use 'dd'. The syntax above will work perfectly if I use GNU dd, but I'd like to simplify the setup and use the built-in n'dd' if possible. So ... is there a freebsd equivalent to the GNU: dd if=/blah of=/bleh oflag=append conv=notrunc syntax ? Anyone ? __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
