[SOLVED] View i-node information

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[SOLVED] View i-node information

Postby banderas20 » 2018-07-29 08:08

Hello,

if I issue ls -li in a directory, it gives me the inodes associated with the files.

¿How can I make to see the i-node information itself? I've tried with "debugfs -w file", "stat inode name", "cat inode name" and it reports "Filesystem not open".

¿How can I do it?

Thanks!
Last edited by banderas20 on 2018-07-30 13:47, edited 1 time in total.
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Re: View i-node information

Postby arzgi » 2018-07-29 11:25

I'm not sure what info you mean, but
Code: Select all
stat [file-name]
shows something.
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Re: View i-node information

Postby GarryRicketson » 2018-07-29 12:49

It depends on the files also, some files would need you to be root, use "su" or "sudo' maybe ? It is not clear to me really what the OP wants to do here, What file ? Which dir ? etc ?
'stat' will work for some info, also 'df', see:
Code: Select all
man df

Note the " i " option:
DF(1) General Commands Manual DF(1)

NAME
df - display free disk space

SYNOPSIS
df [-hiklnP] [-t type] [[file | file_system] ...]

DESCRIPTION
The df utility displays statistics about the amount of free disk space on
the specified file_system or on the file system of which file is a part.
By default, values are displayed as 512-byte block counts. If no
operands are specified, statistics for all mounted file systems are
displayed (subject to the -l and -t options, below).

The options are as follows:

-h "Human-readable" output. Use unit suffixes: Byte, Kilobyte,
Megabyte, Gigabyte, Terabyte, Petabyte, Exabyte in order to
reduce the number of digits to four or less. This option is
incompatible with the -P option.

-i Include statistics on the number of free inodes. This option is
incompatible with the -P option.

or
Code: Select all
man stat

===============

There are many examples here : https://linoxide.com/linux-command/linux-inode/

Another example:
Code: Select all
ls -lia ../../home/<username>/

There is a lot of info and manuals on this available if one just does a search.

Another command worth looking at 'od' ,
Code: Select all
man od

A file name must be given IE:
Code: Select all
od -cd ../../home/garry/<filename> 

More details here: http://140.120.7.21/LinuxKernel/LinuxKernel/node17.html
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Re: View i-node information

Postby banderas20 » 2018-07-29 14:49

Hello.

I know that If I run "stat filename" it gives me the i-node assigned, as well as many other information about the file.

My question was if could take a look at the contents of the i-node itself, in case I could view more information regarding to it.

Thanks a lot :)
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Re: View i-node information

Postby GarryRicketson » 2018-07-29 16:04

Do you really understand and know what a "inode" is ?

http://www.grymoire.com/Unix/Inodes.html What is in an inode?

Before I said the data blocks contain the contents of the file. The inode contains the following pieces of information

Mode/permission (protection)
Owner ID
Group ID
Size of file
Number of hard links to the file
Time last accessed
Time last modified
Time inode last modified
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Re: View i-node information

Postby banderas20 » 2018-07-29 16:19

GarryRicketson wrote:Do you really understand and know what a "inode" is ?

http://www.grymoire.com/Unix/Inodes.html What is in an inode?

Before I said the data blocks contain the contents of the file. The inode contains the following pieces of information

Mode/permission (protection)
Owner ID
Group ID
Size of file
Number of hard links to the file
Time last accessed
Time last modified
Time inode last modified


Thanks for the link!
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Posts: 100
Joined: 2016-11-10 15:30

Re: View i-node information

Postby GarryRicketson » 2018-07-29 17:24

My question was if could take a look at the contents of the i-node itself


Here is some code that might help understand better:
Code: Select all
parrot# ls -i
9504780 .Xauthority      9504801 .dbus            9504769 .ssh             9504829 display.core
9504771 .Xdefaults       9504804 .local           9504830 .thumbnails            2 mount
9504778 .cache           9504774 .login           9504825 Desktop          9504839 rsync.txt
9504796 .config          9504775 .mailrc          9556992 Documents
9504772 .cshrc           9557958 .mozilla         9504828 backgrnd.png
9504773 .cvsrc           9504776 .profile         9504838 background-2.png
parrot# find . -inum 9504839  -print
./rsync
parrot# less rsync.txt
parrot#
 

I use 'ls -i' to get the directory contents , and include the inode ,...
When I use the 'find' command, it shows me the same, that inode number, is for the file
"rsync.txt".... To view the contents of it, I use the 'less' command. You can use 'cat' as well, there are various commands that can be used to view the contents of a file.
Look at what happens when I run the command as a normal user:
Code: Select all
parrot$ ls -i
9504825 Desktop          9504828 backgrnd.png     9504829 display.core     9504839 rsync.txt
9556992 Documents        9504838 background-2.png       2 mount
parrot$ find . -inum 9504839   -print       
find: ./mount/garry/mysecrets: Permission denied
find: ./mount/visitor/.ssh: Permission denied
find: ./mount/visitor/.cache/openbox/sessions: Permission denied
find: ./mount/visitor/.cache/dconf: Permission denied
find: ./mount/visitor/.cache/tint2: Permission denied
find: ./mount/visitor/.cache/mozilla: Permission denied
find: ./mount/visitor/.dbus: Permission denied
find: ./mount/visitor/.local/share: Permission denied
find: ./mount/visitor/.config: Permission denied
find: ./mount/visitor/.mozilla: Permission denied
find: ./mount/visitor/.dillo: Permission denied
find: ./mount/visitor/.fltk: Permission denied
find: ./mount/tester/.ssh: Permission denied
./rsync.txt
 


It works better to run it as root or sudo :
Code: Select all
parrot$ su
Password:
parrot# find . -inum 9504839   -print
./rsync.txt
parrot# find . -inum 9504839   -print
./rsync.txt
parrot# cat rsync.txt
rsync -ravzh garry@XXX.XXX.x.x:/home/garry/*.* /garry/Opensd62-del/
=================
rsync -ravzh /home/garry/Images /home/garry/usb/home/garry/
=============================
rsync -ravzh /home/garry/Images /home/garry/usb/garry/
===================
rsync -ravh /home/garry/mount/garry/Desktop /home/garry/
parrot#

The "inode" is just a number, to view the contents, you view the file name or directory name, associated with that number.
Some times, the file may not be a text file, it may be a binary file, which is when you need to use 'od' or program like "hexedit" that can view and edit binary / hex files.

What you see won't make any sense to you any way, but here is a example of what it,(in this I used "0f0db7876307790c19e1f91eb9095080-le64.cache-7", which is a binary file.
looks like :
Code: Select all
parrot$ less 0f0db7876307790c19e1f91eb9095080-le64.cache-7
"0f0db7876307790c19e1f91eb9095080-le64.cache-7" may be a binary file.  See it anyway?
parrot$ hexedit 0f0db7876307790c19e1f91eb9095080-le64.cache-7
 

==============
Code: Select all
00000000   04 FC 02 FC  07 00 00 00  B0 A2 07 00  00 00 00 00  40 00 00 00  ................@...
00000014   00 00 00 00  60 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00  ....`...............
00000028   60 00 00 00  00 00 00 00  AC B8 B6 5A  00 00 00 00  00 00 00 00  `..........Z........
0000003C   00 00 00 00  2F 75 73 72  2F 58 31 31  52 36 2F 6C  69 62 2F 58  ..../usr/X11R6/lib/X
00000050   31 31 2F 66  6F 6E 74 73  2F 31 30 30  64 70 69 00  8E 01 00 00  11/fonts/100dpi.....
00000064   8E 01 00 00  11 00 00 00  00 00 00 00  81 0C 00 00  00 00 00 00  ....................
------snipped----
 

DO NOT actually edit a binary file unless you really know what you are doing, or have at least made a copy of the original, changing even 1 number will / can corrupt the file and it will no longer work.
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Re: View i-node information

Postby banderas20 » 2018-07-29 17:37

GarryRicketson wrote:
My question was if could take a look at the contents of the i-node itself


Here is some code that might help understand better:
Code: Select all
parrot# ls -i
9504780 .Xauthority      9504801 .dbus            9504769 .ssh             9504829 display.core
9504771 .Xdefaults       9504804 .local           9504830 .thumbnails            2 mount
9504778 .cache           9504774 .login           9504825 Desktop          9504839 rsync.txt
9504796 .config          9504775 .mailrc          9556992 Documents
9504772 .cshrc           9557958 .mozilla         9504828 backgrnd.png
9504773 .cvsrc           9504776 .profile         9504838 background-2.png
parrot# find . -inum 9504839  -print
./rsync
parrot# less rsync.txt
parrot#
 

I use 'ls -i' to get the directory contents , and include the inode ,...
When I use the 'find' command, it shows me the same, that inode number, is for the file
"rsync.txt".... To view the contents of it, I use the 'less' command. You can use 'cat' as well, there are various commands that can be used to view the contents of a file.
Look at what happens when I run the command as a normal user:
Code: Select all
parrot$ ls -i
9504825 Desktop          9504828 backgrnd.png     9504829 display.core     9504839 rsync.txt
9556992 Documents        9504838 background-2.png       2 mount
parrot$ find . -inum 9504839   -print       
find: ./mount/garry/mysecrets: Permission denied
find: ./mount/visitor/.ssh: Permission denied
find: ./mount/visitor/.cache/openbox/sessions: Permission denied
find: ./mount/visitor/.cache/dconf: Permission denied
find: ./mount/visitor/.cache/tint2: Permission denied
find: ./mount/visitor/.cache/mozilla: Permission denied
find: ./mount/visitor/.dbus: Permission denied
find: ./mount/visitor/.local/share: Permission denied
find: ./mount/visitor/.config: Permission denied
find: ./mount/visitor/.mozilla: Permission denied
find: ./mount/visitor/.dillo: Permission denied
find: ./mount/visitor/.fltk: Permission denied
find: ./mount/tester/.ssh: Permission denied
./rsync.txt
 


It works better to run it as root or sudo :
Code: Select all
parrot$ su
Password:
parrot# find . -inum 9504839   -print
./rsync.txt
parrot# find . -inum 9504839   -print
./rsync.txt
parrot# cat rsync.txt
rsync -ravzh garry@XXX.XXX.x.x:/home/garry/*.* /garry/Opensd62-del/
=================
rsync -ravzh /home/garry/Images /home/garry/usb/home/garry/
=============================
rsync -ravzh /home/garry/Images /home/garry/usb/garry/
===================
rsync -ravh /home/garry/mount/garry/Desktop /home/garry/
parrot#

The "inode" is just a number, to view the contents, you view the file name or directory name, associated with that number.
Some times, the file may not be a text file, it may be a binary file, which is when you need to use 'od' or program like "hexedit" that can view and edit binary / hex files.

What you see won't make any sense to you any way, but here is a example of what it,(in this I used "0f0db7876307790c19e1f91eb9095080-le64.cache-7", which is a binary file.
looks like :
Code: Select all
00000000   04 FC 02 FC  07 00 00 00  B0 A2 07 00  00 00 00 00  40 00 00 00  ................@...
00000014   00 00 00 00  60 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00  ....`...............
00000028   60 00 00 00  00 00 00 00  AC B8 B6 5A  00 00 00 00  00 00 00 00  `..........Z........
0000003C   00 00 00 00  2F 75 73 72  2F 58 31 31  52 36 2F 6C  69 62 2F 58  ..../usr/X11R6/lib/X
00000050   31 31 2F 66  6F 6E 74 73  2F 31 30 30  64 70 69 00  8E 01 00 00  11/fonts/100dpi.....
00000064   8E 01 00 00  11 00 00 00  00 00 00 00  81 0C 00 00  00 00 00 00  ....................
------snipped----
 

DO NOT actually edit a binary file unless you really know what you are doing, or have at least made a copy of the original, changing even 1 number will / can corrupt the file and it will no longer work.


Thank you. I think I must first read carefully the link you provided before. :P
banderas20
 
Posts: 100
Joined: 2016-11-10 15:30


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