Many PSFalcon commands support the use of Falcon Query Language ("FQL") statements using the -Filter parameter. When using -Filter, it is important to keep in mind...

• Available FQL filters and their syntax will vary between APIs and are not determined by PSFalcon
• Each FQL filter and value may be case-sensitive (exact case, lowercase only, etc.)
• Each FQL filter statement can contain a maximum of 20 properties

Values in an FQL statement tend to either be restricted to $true, $false, an integer or a string (description, date or time, etc).

The simplest FQL statements require a single condition and value. For instance, to find the host identifier for a device with the hostname ONE, use the following filter:

Get-FalconHost -Filter "hostname:'ONE'"

Many filters will automatically return partial matches, but you can include wildcards (*):

Get-FalconHost -Filter "hostname:*'*ONE*'"

Using square brackets will restrict results to exact matches (including case):

Get-FalconHost -Filter "hostname:['ONE']"

Additional conditions and values can be added using the proper operator. The following filter example will retrieve the host identifier for a device that has a hostname of ONE and is running Windows:

Get-FalconHost -Filter "hostname:'ONE'+platform_name:'Windows'"

To find host identifiers for devices that are named ONE or TWO:

Get-FalconHost -Filter "hostname:'ONE',hostname:'TWO'"

Multiple conditions can be used to retrieve more complex results. The following filter lists host identifiers for devices that are named ONE and are running Windows or are not named TWO and have been seen online within the last two days:

Get-FalconHost -Filter "(hostname:'ONE'+platform_name:'Windows'),(hostname:!'TWO'+last_seen:>'Last 2 days')"

NOTE: 'Last 2 days' is not a valid FQL value when submitted via API. PSFalcon looks for a relative date string like last <integer> hour(s)/day(s) and automatically converts it into an RFC3339 date string (UTC).

For example, at exactly 14:00 hours (Pacific Standard Time) on November 10, 2020 if you attempted to use Get-FalconHost with the following filter:

Get-FalconHost -Filter "last_seen:>'Last 2 days'"

PSFalcon converts your filter to the following value (seen through the Write-Verbose output):

VERBOSE: [ApiClient.Invoke] ... ?filter=last_seen:>'2020-11-10T22:00:00Z'