awk for lvcreate

[Rasheed Tamton]

I have a file like below:
I want to create a text file for creating LVs on the system using this file. It has two lines. The Record Separator starting with vg (e.g., vgidx). So each record is two lines.

What I am looking for is that the output txt file should produce like this; using the first two lines of the file:

lvcreate -L 4080 -n idx01_4g vgidx

--------------
vgidx
idx01_4g 4080
vgidx
idx02_4g 4080
vgidx
idx03_4g 4080
vgidx
idx04_4g 4080
vgidx
idx05_4g 4080
vgidx
idx06_4g 4080
vgidx
idx07_4g 4080
---
Thanks
Rasheed.

[Rodney Hills]

If perl is ok then-

perl -ne 'chomp; /^vg/ && do { $vg=$0l } ; /^id/ && do { ($id,$sz)=split(" ",$_); print "lvcreate -L $sz -n $id $vg\n"; }' inputfile

HTH

-- Rod Hills

[Hoefnix]

Or use awk:

cat input-file | awk '/^vg/ {VG=$1} /^id/ {print "lvcreate -L 4080 -n " $1" "$2" "VG}' >output-file

HTH,
Peter

[Hoefnix]

Sorry mist an item:
this will be the way:
cat input-file | awk '/^vg/ {VG=$1} /^id/ {print "lvcreate -L "$2" -n " $1" "VG}' >output-file

Sorry for the mistake,
Peter

[Kent Ostby]

Hmmm.. I think there's a minor error in Pete's script.

I think it should be:


cat input-file | awk '/^vg/ {VG=$1} /^id/ {print "lvcreate -L " $2 " -n " $1" "
VG}' >output-file

[Hoefnix]

Kent,

You are right, I saw it myself and posted the correction just before you ;-)

Regards,
Peter

[Rasheed Tamton]

I think I was not too clear. There are around 22 VGs other than vgidx and I do not get the expected answer. Please be more clear.

Thanks

[Rasheed Tamton]

Sorry Rodney, I got some compilation errors with the Perl stuff. I could not test it on my system. Also I am still not comforatble with Perl.

[Jim Mallett · Accepted solution]

Rasheed,

The awk examples above work with your given sample data. If you have VGs and LVs that don't use the above naming convention you can try this:

awk '{vg=$0; getline; print "lvcreate -L " $2 " -n " $1 " " vg}' test.txt

I created a sample file with the following data:
1vgidx1
idx01_4g 4080
2vgidx2
idx02_4g 6120
3vgidx3
idx03_4g 8160

And the output of the command above was:
$ awk '{vg=$0; getline; print "lvcreate -L " $2 " -n " $1 " " vg}' test.txt
lvcreate -L 4080 -n idx01_4g 1vgidx1
lvcreate -L 6120 -n idx02_4g 2vgidx2
lvcreate -L 8160 -n idx03_4g 3vgidx3

This should work without worrying about the VG or LV starting characters.

Jim

[Volker Borowski]

Hi,

no syntaxcheck, and no empty lines required !


awk '{ VG=$1
getline
print "lvcreate -L " $2 " -n " $1 " " VG
}' infile

lvcreate -L 4080 -n idx01_4g vgidx
lvcreate -L 4080 -n idx02_4g vgidx
lvcreate -L 4080 -n idx03_4g vgidx
lvcreate -L 4080 -n idx04_4g vgidx
lvcreate -L 4080 -n idx05_4g vgidx
lvcreate -L 4080 -n idx06_4g vgidx
lvcreate -L 4080 -n idx07_4g vgidx


Trick is to store the VG-Name in VG and to read the next line and after that generate the output line.

Hope this helps
Volker