the one that gave me the long heart stoppage was long, long ago on an 
old v7 pdp that had many local hacks (resume from core on power fail, 
for example :-) that crashed regularly during finals week.  so i'm the 
freshman that comes in at 2am when the seniors are panicing.

eventually i type (on the la-120 line printer console) something like:

ncheck /dev/diskname > /dev/diskname

instead of:

ncheck /dev/diskname > /tmp/logfile

about 5 seconds after i hit return i realized what i had done and felt 
my heart stop.  luckily ncheck (or icheck or dcheck) didn't produce 
output until it had been running for quite some time, so i managed to 
not stomp all over the superblock.

shortly thereafter we installed bsd 2.9 which had fsck, plus the system 
stopped crashing all the time.

On 2011-05-13 15:54, Tom Perrine wrote:
> Those of you not in #lopsa (shame on you!) are missing a great thread...
>
> Great typos, the best way to destroy a system, unexpected command line
> results...
>
> Here are a few:
>
> Reformatting a partition that was in use
> rm -rf .?
> removing /lib/libc.so
>
> So, what's your most memorable command line typo, "think-o",
> "brain-fart", or "#$$@#$*&@#$" moment?
>
> What subtle opportunity for massive destruction would you pass on as a
> warning to the next generation of system administrators?
>
> Don't limit yourself to bash/csh, feel free to explore databases,
> storage and network catastrophes!
>
> "Share and enjoy"
>
> --tep
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