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Old 11-15-2009, 01:28 AM   #1
Ammad
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Registered: Apr 2004
Distribution: redhat 9.0, fc4, redhat as 4
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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
 
Old 11-15-2009, 07:24 AM   #2
catkin
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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.
 
Old 11-15-2009, 08:35 AM   #3
Ammad
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thanks, catkin. i will check this.
 
  


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