I am trying to create an bash script to expand a LVM disk, I mean, trying to automatize all the process from the video bellow:
Youtube search:
How To Extend LVM Disk For Linux Virtual Machine On VMware
At this point, I am very new in bash script and I am facing this just as a try, I don't know if I will get the final result that I need.
Well, I am stuck at the grep option bellow:
Code:
#!/bin/bash
# Increase LVM Disk
echo"$(fdisk -l)"
echo Which disk you want to increase the size? "(Please provide the full path, Example: /dev/sda2):"
read disk1
diskcompare="$(fdisk -l | grep "$disk1 " -o --max-count=1)"
if [ "$diskcompare" == "$disk1 " ]; then
echo"Valid Disk."
else
echo"Invalid Disk."
fi
I would like to compare the path (disk1) with the fdisk -l command to check if it is a valid disk.
The problem is that the way that it is writed at the moment it accept you to continue the script if you not type the entire path, example:
Code:
[root@linuxtest ~]# ./test.sh
Disk /dev/sda: 16.1 GB, 16106127360 bytes, 31457280 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000d345c
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 16777215 7339008 8e Linux LVM
/dev/sda3 16777216 31457279 7340032 8e Linux LVM
Disk /dev/mapper/centos-root: 14.2 GB, 14164164608 bytes, 27664384 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk /dev/mapper/centos-swap: 859 MB, 859832320 bytes, 1679360 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Which disk you want to increase the size? (Please provide the full path, Example: /dev/sda2):
/sda2
Valid Disk.
[root@linuxtest ~]#
It should match only the exactly values /dev/sda1 , /dev/sda2 or /dev/sda3.
Any help will be welcomed
Ty!
Last edited by Scrutinizer; 03-12-2020 at 09:14 AM..
Reason: quote tags -> code tags; Removed non-existing-font definition; Removed multi-color
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LEARN ABOUT SUNOS
prtvtoc
prtvtoc(1M) System Administration Commands prtvtoc(1M)NAME
prtvtoc - report information about a disk geometry and partitioning
SYNOPSIS
prtvtoc [-fhs] [-t vfstab] [-m mnttab] device
DESCRIPTION
The prtvtoc command allows the contents of the label to be viewed. The command can be used only by the super-user.
The device name can be the file name of a raw device in the form of /dev/rdsk/c?t?d?s2 or can be the file name of a block device in the
form of /dev/dsk/c?t?d?s2.
OPTIONS
The following options are supported:
-f Report on the disk free space, including the starting block address of the free space, number of blocks, and unused parti-
tions.
-h Omit the headers from the normal output.
-m mnttab Use mnttab as the list of mounted filesystems, in place of /etc/mnttab.
-s Omit all headers but the column header from the normal output.
-t vfstab Use vfstab as the list of filesystem defaults, in place of /etc/vfstab.
EXAMPLES
Example 1: Using the prtvtoc Command
The following example uses the prtvtoc command on a 424-megabyte hard disk:
example# prtvtoc /dev/rdsk/c0t3d0s2
* /dev/rdsk/c0t3d0s2 partition map
*
* Dimension:
* 512 bytes/sector
* 80 sectors/track
* 9 tracks/cylinder
* 720 sectors/cylinder
* 2500 cylinders
* 1151 accessible cylinders
*
* Flags:
* 1: unmountable
* 10: read-only
* * First Sector Last
* Partition Tag Flags Sector Count Sector Mount Directory
0 2 00 0 76320 76319 /
1 3 01 76320 132480 208799
2 5 00 0 828720 828719
5 6 00 208800 131760 340559 /opt
6 4 00 340560 447120 787679 /usr
7 8 00 787680 41040 828719 /export/home
example#
The data in the Tag column above indicates the type of partition, as follows:
Name Number
UNASSIGNED 0x00
BOOT 0x01
ROOT 0x02
SWAP 0x03
USR 0x04
BACKUP 0x05
STAND 0x06
VAR 0x07
HOME 0x08
ALTSCTR 0x09
CACHE 0x0a
RESERVED 0x0b
The data in the Flags column above indicates how the partition is to be mounted, as follows:
Name Number
MOUNTABLE, READ AND WRITE 0x00
NOT MOUNTABLE 0x01
MOUNTABLE, READ ONLY 0x10
Example 2: Using the prtvtoc Command with the -f Option
The following example uses the prtvtoc command with the -f option on a 424-megabyte hard disk:
example# prtvtoc -f /dev/rdsk/c0t3d0s2
FREE_START=0 FREE_SIZE=0 FREE_COUNT=0 FREE_PART=34
Example 3: Using the prtvtoc Command on a Disk Over One Terabyte
The following example uses uses the prtvtoc command on a disk over one terabyte:.
example# prtvtoc /dev/rdsk/c1t1d0s2
* /dev/rdsk/c1t1d0s2 partition map
*
* Dimensions:
* 512 bytes/sector
* 3187630080 sectors
* 3187630013 accessible sectors
*
* Flags:
* 1: unmountable
* 10: read-only
*
* First Sector Last
* Partition Tag Flags Sector Count Sector Mount Directory
0 2 00 34 262144 262177
1 3 01 262178 262144 524321
6 4 00 524322 3187089340 3187613661
8 11 00 3187613662 16384 318763004
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO devinfo(1M), fmthard(1M), format(1M), mount(1M), attributes(5)WARNINGS
The mount command does not check the "not mountable" bit.
SunOS 5.10 25 Jul 2002 prtvtoc(1M)
03-12-2020
