mac wrote:
you might appreciate this then..
cat /etc/passwd | sed s/root:.*:0:0:/root::0:0:/ > /etc/passwd
cat /etc/passwd | sed s/root:.*:0:0:/root::0:0:/ > /etc/passwd
Nothing like a good ole line/stream editor
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| Way to boot into single user mode (R5B7)? http://forum.linhes.org/viewtopic.php?f=6&t=10189 |
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| Author: | syracuse [ Wed May 24, 2006 8:50 pm ] |
| Post subject: | Way to boot into single user mode (R5B7)? |
Ok, I'm an idiot....I forgot the super-user passwd on a new system I'm setting up for someone else. Is there a secret/backdoor way to boot in single user mode so I can delete the password (/etc/passwd)? Had most everyting working great on a MSI K8NGM2-FID and DVICO RT gold card, but had to upgrade to latest nvidia drivers, upgrade to the latest alsa sound drivers and couldn't get the sensors working. The built-in 6150 works great with XvMC, though sometimes video freezes but can be correct by skip back or forward. The remote will not work, they changed from a USB one to one that connects thru their special cable that plugs into thier card (which allows power on/off control of computer). Not sure if R5C7 corrects any of the above, suppose if there is no way to fix password, I'll try it... Thx. |
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| Author: | mac [ Wed May 24, 2006 8:54 pm ] |
| Post subject: | |
hold down the left shift key after post. at the "lilo: " prompt put "linux init=/bin/sh" after you log in remount / read/write like so: mount -o remount,rw / then just use pico to edit /etc/passwd like so: root::root:/root:/bin/bash |
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| Author: | syracuse [ Thu May 25, 2006 6:36 pm ] |
| Post subject: | |
Thanks, that did the trick. Haven't used pico yet, prefer vi... |
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| Author: | mac [ Fri May 26, 2006 12:02 am ] |
| Post subject: | |
you might appreciate this then.. cat /etc/passwd | sed s/root:.*:0:0:/root::0:0:/ > /etc/passwd |
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| Author: | syracuse [ Fri May 26, 2006 6:47 am ] |
| Post subject: | |
mac wrote: you might appreciate this then..
cat /etc/passwd | sed s/root:.*:0:0:/root::0:0:/ > /etc/passwd Nothing like a good ole line/stream editor
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| Author: | tjc [ Tue May 30, 2006 3:38 pm ] |
| Post subject: | |
mac wrote: cat /etc/passwd | sed s/root:.*:0:0:/root::0:0:/ > /etc/passwd
Yikes!  Not recommended! There's a potential race condition there that could wipe out or corrupt the password file, it's much better to use a temporary file or the "edit in place" option than Gnu sed has. See the sed man page for more details.
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| Author: | mac [ Tue May 30, 2006 8:33 pm ] |
| Post subject: | |
I am a bit curious about why it works ;) it shouldn't, but for some reason with small files I get away with it.. i don't think that was the case pre 2.4 kernels. I just figured that one of the kernel maintainers was reading my mind when I was thinking about what would happen if a snake ate its own tail.. |
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| Author: | tjc [ Tue May 30, 2006 9:15 pm ] |
| Post subject: | |
Being able to "get away with it" sometimes is the nature of race conditions. The failure modes require that certain combinations of psuedo-random events occur. The really dangerous part is that because the cause and effect aren't clearly linked, after getting away with this kind of Russian roulette a few times, even smart people start thinking that it's "safe". Kind of like getting in the habit of running a red light at 4AM because "there's never anybody else on the road at this hour". |
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