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| The VMS Kid 2002-06-20, 5:41 am |
| You do an "ls -l" on an HP-UX box and see a file that looks like this:
-rwx r-xr-x 1 vmskid users 24633 Jun 17 06:45 perm.c
Then you su to the superuser account and type "rm perm.c". You get the following message back:
"rm: perm.c non-existent"
What is the problem? | |
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| what kind of file is it ? | |
| The VMS Kid 2002-06-20, 6:21 am |
| $ file perm.c
perm.c: c program text | |
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| hey there VMS..
when you su... does it by any chance put you in a different directory? such as root's home? Just a thought...
-Mike | |
| Supertech 2002-06-20, 7:17 am |
| try a chmod 777 perm.c
or
try changing the file name, deleting the .c
or
cat perm.c - to see whats in it
be careful, this is a compiled C program so If you didn't compile it in the first place, you might be deleting a system file. | |
| The VMS Kid 2002-06-20, 7:37 am |
| OK. I am in the directory of the file which I am wishing to delete. I am su, so the permissions don't matter, but I have read write and execute permission in the directory and read and write permission to the file. It is not a system file since I am the one who wrote it. It is not compiled C object code, but C source code. The compiled program is "perm". What is wrong.
I actually know the answer, as it was asked to me at a job interview that I had. Just want to know if I am the only one who didn't know about this. | |
| Supertech 2002-06-20, 7:57 am |
| "I actually know the answer, as it was asked to me at a job interview that I had. Just want to know if I am the only one who didn't know about this."
ain't you smart... I certainly won't waste any more of my time trying to answer your trick questions. thank you. | |
| The VMS Kid 2002-06-20, 8:16 am |
| Sorry, didn't mean to piss anyone off, but the question kind of caught me off-guard. The problem was that the file contains some ASCII non-printing characters. :S You need to use a special ls option to see them. | |
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| so it is a quiz .....
my answer :the immutable flag is set on that file with the chattr +i command ? | |
| The VMS Kid 2002-06-20, 11:50 am |
| To get control characters into the string, type CTRL-V followed
by the control character. Try this:
$ touch `echo 'tricky[CTRL-V][CTRL-L]'`
Then do a listing. You will see tricky listed, but you need special options (usually -b or -v) to see the *real* filename. | |
| ccieToBe 2002-06-20, 4:18 pm |
| I was guessing that something was up with the file name so I would have said trying using some wild cards (*) in the file name for the rm command. My secondary guess was that the fs is courupt I guess I was close  | |
| The VMS Kid 2002-06-21, 5:16 am |
| Well, I remember reading that you could include "non-printing" characters in a Unix file, but I forgot about it. So it kind of baffled me when this guy asked me this question. The other possibility is that the file was on a different filesystem I think, although he was speaking of HP-UX specifically so am not sure if this would generalize to other Unixes. But I think its neat now that I know it. |
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