README


The accompanying program "fstabxref"  takes a /etc/fstab table similar to TABLE ONE
listed below, It reads the UUID values, looks up the corresponding hardware device address
and appends that information as a comment to the end of the UUID line.
It also knows how to format the LABEL Line
Refer to TABLE TWO below for an example of an output of the program.

The program takes  take zero, one or two arguments.

By design, the fstabxref  program will not write to /etc/fstab.
Do not use redirection to force overwrite of /etc/fstab

The program has a few options.

OPTION ONE  No arguments
fstabxref will read  /etc/fstab and display its results to standard output (terminal),
the cross referenced lookup.   Use it this way as
	
		fstabxref > /tmp/fstab   or fstabxref | vi - 

OPTION TWO
Copy /etc/fstab to some other location eg, /tmp 
Redirect input to the other fstab copy 

		fstabxref -i some_fstab_copy  > /tmp/fstab         
or   		fstabxref -i  some_fstab_copy  | vi -  
or 		fstabxref -i  some_fstab_copy  | less


OPTION THREE
You can redirect output to a file other than /etc/fstab

		fstabxref -o  /tmp/fstab_copy            
 
OPTION FOUR
You an do both select input and output:

	fstabxref  -i some_fstab_file  -o xrefed_fstab	
or	fstablsblk -i some_fstab_file  -o xrefed_fstab 

Note the ntfs UUID and the ntfs LABEL=  These were contrived to show the formatting with
variable sized UUID values
TABLE ONE  --Before
=============================================================================================================
#
# /etc/fstab
# Created by anaconda on Thu Mar  3 03:43:36 2016
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
#<file system>				 <mount>		   <type>   <options>         <dump> <pass>
            UUID=5FBD7164754805FF /windata  ntfs defaults,noatime  1     1         
LABEL=DoNotDeleteMe /windata ntfs defaults,noatime    1   1         
UUID=e825a1b2-fc60-46ee-be03-8a7f4444c5b4 /                         ext4    defaults,noatime	1 1 
UUID=cb1cbb1a-a311-4860-b6dd-060dc88aa330 /boot                     ext4    defaults,noatime	1 2 
UUID=e387b85b-766f-4572-8ab1-e9699c38ac88 /home                     xfs     defaults,noatime	0 0 
UUID=d8b32a2f-7022-4b1a-a3b7-603721b51882 swap                      swap    defaults,noatime	0 0 
UUID=6e488205-8791-41c2-8043-5051f8d0b185 /scratch                  ext4    defaults,noatime	1 2 
UUID=e09c1a4b-142f-48e8-a538-60b27f169be2 /scratch1                 ext4    defaults,noatime	1 2 
UUID=6c830a28-b62e-429c-bc36-988e3cb2c768 /sdd1spare                xfs     defaults,noatime	1 2 

LABEL=sde1Spare                           /Development              xfs     defaults,noatime	1 2 
#UUID=9f9d9bb3-2c94-4264-8604-1f887ee62696 /scratch2                ext4   defaults,noatime	1 2  
#UUUID=923a26b2-81e5-40d2-93a7-882e3aadbe2f /scratch1 		    xfs	   defaults,noatime	1 2 
================================================================================================================


TABLE TWO  (result)
================================================================================================================
#
# /etc/fstab
# Created by anaconda on Thu Mar  3 03:43:36 2016
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
#<file system>				 <mount>		   <type>   <options>          <dump> <pass>
UUID=5FBD7164754805FF 			  /windata                  ntfs    defaults,noatime	1 1 #/dev/sda4
LABEL=DoNotDeleteMe                       /windata                  ntfs    defaults,noatime	1 1 #/dev/sda4
UUID=e825a1b2-fc60-46ee-be03-8a7f4444c5b4 /                         ext4    defaults,noatime	1 1 #/dev/sde4
UUID=cb1cbb1a-a311-4860-b6dd-060dc88aa330 /boot                     ext4    defaults,noatime	1 2 #/dev/sde3
UUID=e387b85b-766f-4572-8ab1-e9699c38ac88 /home                     xfs     defaults,noatime	0 0 #/dev/sde5
UUID=d8b32a2f-7022-4b1a-a3b7-603721b51882 swap                      swap    defaults,noatime	0 0 #/dev/sde6
UUID=6e488205-8791-41c2-8043-5051f8d0b185 /scratch                  ext4    defaults,noatime	1 2 #/dev/sdb2
UUID=e09c1a4b-142f-48e8-a538-60b27f169be2 /scratch1                 ext4    defaults,noatime	1 2 #/dev/sdd2
UUID=6c830a28-b62e-429c-bc36-988e3cb2c768 /sdd1spare                xfs     defaults,noatime	1 2 #/dev/sdd1

LABEL=sde1Spare                           /Development              xfs     defaults,noatime	1 2 #/dev/sde1
#UUID=9f9d9bb3-2c94-4264-8604-1f887ee62696 /scratch2                ext4   defaults,noatime	1 2  
#UUUID=923a26b2-81e5-40d2-93a7-882e3aadbe2f /scratch1 		    xfs	   defaults,noatime	1 2 
=================================================================================================================

Leslie Satenstein
May 22, 2016
[email protected]
[email protected]
[email protected]