Em 16-07-2012 21:20, Baho Utot escreveu: > On Monday, July 16, 2012 08:09:23 PM Bruce Dubbs wrote: >> Baho Utot wrote: >>> One could do this >>> >>> echo "test file" > test >>> ln test link1 >>> ln test link2 >>> ln link1 link3 >>> >>> ls -i >>> >>> 1333952 test 1333952 link1 1333952 link2 1333952 link3 >>> >>> rm test >>> ls -i >>> 1333952 link1 1333952 link2 1333952 link3 >>> >>> Doesn't link[1..3] point to "no where" or garbage? >> >> No, they point to the data. The rm command only deletes the data when >> the link count goes to zero. That is, rm removes the entry from >> directory, and decrements the link count. >> >> $ echo "test file" > test >> $ ls -l test >> -rw-rw-r-- 1 bdubbs bdubbs 10 Jul 16 18:58 test >> $ ls -i test >> 1016053 test >> >> Note in the fist form the refernece count is 1. >> $ ln test1 test >> $ ls -l test* >> -rw-rw-r-- 2 bdubbs bdubbs 10 Jul 16 18:58 test >> -rw-rw-r-- 2 bdubbs bdubbs 10 Jul 16 18:58 test1 >> $ ls -1i test* >> 1016053 test >> 1016053 test1 >> >> The link count is 2. >> >> $ rm test >> $ cat test1 >> test file >> >> The data is still there. >> >> $ ls -l test* >> -rw-rw-r-- 1 bdubbs bdubbs 10 Jul 16 18:58 test1 >> >> but now the link count is 1. This is also the reason you cannot rmdir a >> directory that is not empty. Note too that if you have two files with >> the same inode, the system will copy the data if you edit either one. >> You then have two different files, each with a count of 1. > > That is weird, I would have expected both files to contain the same data. > Not > for the "system" to go behind your back and create two separate files. > I guess I have too much C programming (from my old programming days) in my > line of thought. I would have been nice to add data to one "file" and > readout > the data with the other (aka) dup file handles under C. > > > > > > >> >> Try it. >> >> -- Bruce
$ echo "test file" > test $ ls -l test -rw-rw-r-- 1 fernando fernando 10 Jul 16 21:36 test $ ls -i test 262710 test $ ln test1 test $ ls -l test* -rw-rw-r-- 2 fernando fernando 10 Jul 16 21:36 test -rw-rw-r-- 2 fernando fernando 10 Jul 16 21:36 test1 $ ls -1i test* 262710 test 262710 test1 $ echo "test file 2" >> test $ diff -Nau test test1 $ ls -l test* -rw-rw-r-- 2 fernando fernando 22 Jul 16 21:43 test -rw-rw-r-- 2 fernando fernando 22 Jul 16 21:43 test1 $ ls -1i test* 262710 test 262710 test1 It seems changing one, the other is changed too.-- []s, Fernando -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
