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Top Forums UNIX for Dummies Questions & Answers Knowing when a different program modifies a file Post 302797543 by hanson44 on Monday 22nd of April 2013 06:54:40 PM
Old 04-22-2013
Quote:
The OP stated having to restart to resume logging
I can't seen the OP's machine to know what really happened. If restart was really needed, then I agree. On my test, restart was not needed. Anyway, based on our tests (see below), it all makes sense.

----------------------------
Code:
Your test:
$ echo foo > file
$ cat file
foo
$ ls -i file
472445 file
$ # vim 7.0 opens file in a different terminal, showing just one line, "foo"
$ echo bar >> file
$ cat file
foo
bar
$ ls -i file
472445 file
$ # vim :wq in the other  (after it warns that the file has changed)
$ cat file
foo
$ ls -i file
472449 file

I just saw this previous post (above). It was at the same time I posted, so got missed. I re-ran the exact sequence of operations (below), using vim 7.3.547 and linux, as a reality check, and the inode does not change:
Code:
My re-test:
$ echo foo > file
$ cat file
foo
$ ls -i file
786454 file
$ # vim 7.3 opens file in a different terminal, showing just one line, "foo"
$ cat file
foo
$ echo bar >> file
$ cat file
foo
bar
$ ls -i file
786454 file
$ # vim :wq in the other  (after it warns that the file has changed)
$ cat file
foo
$ ls -i file
786454 file

It seems you have shown that vim can be configured to create a new file with a new inode. As you explained, it has something to do with the backup file. My vim happens not to be configured that way (I don't think I would want it configured that way). The OP could well have had their vi configured in that way, so that would explain what happened. But that wasn't the question. The previous contention was that vim had to create a new file, that the inode had to change, due to something more fundamental going on. It was the believable idea Nothing to do with vi nor syslog; it's just the way the file system works that nobody else objected to, that I decided to investigate. I just wanted to know the answer. My test shows that shows vim does not have to create a new file. Your test shows vim can be configured to create a new file.

Quote:
If by "overwritten" you mean that the editor changed the
file's contents, then you are wrong. If by "overwritten" you
mean that the editor created a completely different file,
then you are correct.
If the inode does not change, isn't it still the original file? The inode does not change in my test, as shown above. Your test shows that vim can be configured to create a new file under the test conditions, not that the new file creation is inevitable or required. I appreciate that you posted the test, and helped clarify this.
 

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VIMTUTOR(1)                                                   General Commands Manual                                                  VIMTUTOR(1)

NAME
vimtutor - the Vim tutor SYNOPSIS
vimtutor [-g] [language] DESCRIPTION
Vimtutor starts the Vim tutor. It copies the tutor file first, so that it can be modified without changing the original file. The Vimtutor is useful for people that want to learn their first Vim commands. The optional argument -g starts vimtutor with gvim rather than vim, if the GUI version of vim is available, or falls back to Vim if gvim is not found. The optional [language] argument is the two-letter name of a language, like "it" or "es". If the [language] argument is missing, the lan- guage of the current locale will be used. If a tutor in this language is available, it will be used. Otherwise the English version will be used. Vim is always started in Vi compatible mode. FILES
/usr/share/vim/vim80/tutor/tutor[.language] The Vimtutor text file(s). /usr/share/vim/vim80/tutor/tutor.vim The Vim script used to copy the Vimtutor text file. AUTHOR
The Vimtutor was originally written for Vi by Michael C. Pierce and Robert K. Ware, Colorado School of Mines using ideas supplied by Charles Smith, Colorado State University. E-mail: bware@mines.colorado.edu. It was modified for Vim by Bram Moolenaar. For the names of the translators see the tutor files. SEE ALSO
vim(1) 2001 April 2 VIMTUTOR(1)
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