Use of sed/awk Post: 302293878

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Top Forums Shell Programming and Scripting Use of sed/awk Post 302293878 by haris on Wednesday 4th of March 2009 04:01:50 AM

03-04-2009

Registered User

Hi radoulov,

thanks a lot

i have got one more query

i have one file cpu and its content are:

Data Collected: 05/17/08 17:19:49

Refresh Interval: 600 seconds

GlancePlus Started/Reset: 05/17/08 08:19:45
B3692A GlancePlus C.03.72.00 17:29:49 UXAMSK01 9000/800 Current Avg High
-------------------------------------------------------------------------------
CPU Util SSUUUUU | 16% 9% 22%
Disk Util F | 1% 5% 12%
Mem Util SSSSSSSSSSUUUUUUUUBBBBB | 46% 45% 46%
Swap Util UUUURRRRR | 17% 16% 17%
-------------------------------------------------------------------------------
IO BY FILE SYSTEM Users= 8
Idx File System Device Type Logl IO Phys IO
--------------------------------------------------------------------------------
1 / /dev/vg00/lvol3 vxfs 24.8/ 25.1 0.5/ 0.5
2 /stand /dev/vg00/lvol1 hfs 0.0/ 0.0 0.0/ 0.0
3 /var /dev/vg00/lvol8 vxfs 0.2/ 0.3 1.9/ 2.1
4 /usr /dev/vg00/lvol7 vxfs 35.2/ 17.7 0.9/ 0.7

Top disk user: PID 11053, s_server 10.0 IOs/sec S - Select a Disk

Now i m using this code

sed -n '1p;8,10 {;s/^$[^ ]*$ [^0-9]*$[0-9]*%$.*$/\1 \2/p;}' cpu

to get output as:

Data Collected: 05/17/08 17:19:49
CPU 16%
Disk 1%
Mem 46%

i want to know few things about this code as to how it works
{;s/^$[^ ]*$ [^0-9]*$[0-9]*%$.*$/\1 \2/p;};
specially difference between ^ individually and like this [^ ]* and in this case
how it will directly take the second part of output i.e the % part bcoz in line 8-10
the % part comes after delimeter '|' so how does it actually work

and [^0-9]*$[0-9]*%) does it mean starting from 0-9 any character followed by 0-9 any charcter with % symbol

and what does this .*$ mean

and lastly this \1 \2/p;}; how does it work

Please help me

s/^\([^ ]*$

haris

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LEARN ABOUT REDHAT

vgcfgrestore

VGCFGRESTORE(8) 					      System Manager's Manual						   VGCFGRESTORE(8)

NAME

       vgcfgrestore - restore volume group descriptor area

SYNOPSIS

       vgcfgrestore   [-b|--backup_number   VolumeGroupBackupNumber]  [-d|--debug]  [-f|--file	VGConfPath]  [-l[l]|--list  [--list]]  [-h|--help]
       [-i|--ignore_size] [-n|--name VolumeGroupName] [-o|--oldpath OldPhysicalVolumePath] [-t|--test] [-v|--verbose] [PhysicalVolumePath]

DESCRIPTION

       vgcfgrestore allows you to restore the volume group descriptor area from backup files in /etc/lvmconf or from VGConfPath to the given Phys-
       icalVolumePath.	 The  default  backup  file is /etc/lvmconf/VolumeGroupName.conf.  This command DOES NOT restore data contained in logical
       volume(s), only the LVM configuration metadata!

   OPTIONS
       -b, --backup_numberVolumeGroupBackupNumber
	      Restore from the specified backup number. Use together with option -n which gives the name of the volume group. See examples below.

       -d, --debug
	      Enables additional debugging output (if compiled with DEBUG).

       -f, --file VGConfPath
	      Restore from the specified path. Useful for selection of specific backups in the backup history or for copies of VGDA backups.

       -i, --ignore_size
	      Restore though the size of the physical volume doesn't match the one in the backup.

       -l, --list
	      Display volume group information contained in the backup file.  If given twice, the physical and	logical  volume  information  con-
	      tained in the backup file is also shown.

       -h, --help
	      Print a usage message on standard output and exit successfully.

       -n, --name VolumeGroupName
	      Do a restore for this volume group name.

       -o, --oldpath OldPhysicalVolumePath
	      If  the  path  to the physical volume has changed between backup time and restore time, this option enables you to choose the corre-
	      sponding physical volume path in the backup file.

       -t, --test
	      Do a test run reading the volume group backup WITHOUT trying to restore it

       -v, --verbose
	      Give verbose runtime information about vgcfgrestore's activities.

       --version
	      Output the version number and exit successfully.

Examples
       To display information like with "vgdisplay vg00" stored in the backup file /etc/lvmconf/vg00.conf:

	    vgcfgrestore -n vg00 -l

       To restore the VGDA of vg00 from the alternative backup file /tmp/vg00-old to physical volume /dev/sdn1:

	    vgcfgrestore -f /tmp/vg00-old -n vg00 /dev/sdn1

       To restore the VGDA of vg00 from the alternative backup file
       /etc/lvmconf/vg00.conf.5.old
       to physical volume
       /dev/sda5 :

	    vgcfgrestore -n vg00 -b 5 /dev/sda5

DIAGNOSTICS

       vgcfgrestore returns an exit code of 0 for success and > 0 for error:

       1  no physical volume on command line
       2  invalid physical volume name
       3  volume group is active
       4  error doing restore to physical volume
       5  backup is invalid for this volume group
       6  volume group is inconsistent
       7  physical volume doesn't belong to volume group backup
       8  error reading physical volume
       9  error getting size of physical volume
       10 error writing VGDA to physical volume(s)
       11 error removing special files of volume group
       12 error setting volume group into lvmtab
       13 error doing backup

       95 driver/module not in kernel
       96 invalid I/O protocol version
       97 error locking logical volume manager
       98 invalid lvmtab (run vgscan(8))
       99 invalid command line

SEE ALSO

       lvm(8), vgcfgbackup(8), vgcreate(8)

AUTHOR

       Heinz Mauelshagen <Linux-LVM@Sistina.com>

Heinz Mauelshagen						     LVM TOOLS							   VGCFGRESTORE(8)

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