I am new to Powershell script I am using vmstat command and i am trying to filter values based on total memory and used memory.
I have done this way but i am not able to just filter value.
PS /home/ec2-user> $usedmem = vmstat -s | Select-String 'used memory'
PS /home/ec2-user> $usedmem
217976 K used memory
But my question is,
how can i just get the value(217976) for used memory
I really appreciate your help
An approach using Regex pattern capture:
$usedMemLine = vmstat -s | Select-String "(.+) . used memory"
$usedValue = $usedMemLine.Matches[0].Groups[1].Value
Here's one way. Split it on whitespace, and pick the first resulting array element.
(-split $usedmem)[0]
217976
A better RegEx approach:
if($usedMem -match "^\s*(\d+).*"){$matches[1]}
Explanation:
^ Match characters at the beggining of string
\s Match a White space
* Match 0 or more instances of previous character
( Start grouping of specific match
\d Match a 0-9 digit
+ Match 1 or more instances of previous character
) End grouping of specific match
. Match any character
* Match 0 or more instances of previous character
$matches[1] returns the K value only, where $matches[0] will return the whole string.
