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Ammad

11-15-2009 01:28 AM

lvm snapshot using script

Hi,

I am writing a script to create backup of data on LVM. when i try to put variable in place of size number it stops, and put error on console.

Code:



[root@swd data]# lvcreate --size $sumM --snapshot -n backup /dev/vg_swd/LogVol02

  Invalid argument --snapshot

  Error during parsing of command line.

Code:



whereas same command works without any error. 

[root@swd data]# lvcreate --size 510M --snapshot -n backup /dev/vg_swd/LogVol02

catkin

11-15-2009 07:24 AM

The variable is $sum but the variable name given on the command is $sumM. Any of these will work

Code:

${sum}M

"${sum}M"

"$sum"M

$sum'M'

"$sum"'M'

The forms in which $sum (or $sum}) are in double quotes are more a little more robust in case $sum does not contain the expected integer but a value including whitespace such as space.

Ammad

11-15-2009 08:35 AM

thanks, catkin. i will check this.

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