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Experience is what allows you to recognize a mistake the second time you make it
This is common shell script mistake. But it also happens in interactive mode, especially when sysadmin works under severe time pressure or is very tired.
Once I was going to make a new file system using mkfs. The device I wanted to make it on was /dev/c0d1s8. The device name that I used, however, was /dev/c0d0s8 which held a very important application. I had always been a little annoyed by the 10 second wait that mkfs has before it actually makes the file system. I'm sure glad it waited that time though. I probably waited 9.9 seconds before I realized my mistake and hit that DEL key just in time. That was a near disaster avoided.
Another time I wasn't so lucky. I was a very new SA, and I was trying to clean some junk out of a system. I was in /usr/bin when I noticed a sub directory that didn't belong there. A former SA had put it there. I did an ls on it and determined that it could be zapped. Forgetting that I was still in /usr/bin, I did an rm *. No 10 second idiot proofing with rm. Now if some one would only create an OS with a "Do what I mean, not what I say" feature.
Gary "Experience is what allows you to recognize a mistake the second time you make it." Fowler
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