// question
Within Linux process execution records, locate any bash commands where the HISTFILESIZE environment variable was exported. What value was assigned to HISTFILESIZE?
Reference KQL answer and model-by-model comparison.
5cafd6c1-2f43-46eb-ac47-a5301ba0a618
question id
20/23
models correct
1
valid answer
87%
success rate
// reference answer
Human-validated correct answer for this question.
0
// model comparison
| Model | Answer | KQL query | Status | Tries | Time | Cost |
|---|---|---|---|---|---|---|
| gemini-2.5-flash-preview-04-17 | 0 | DeviceProcessEvents | where FileName == "bash" or ProcessCommandLine contains "bash" | where ProcessCommandLine contains "export HISTFILESIZE=" | extend HISTFILESIZE_Value = extract(@"export\s+HISTFILESIZE=([^\s]+)", 1, ProcessCommandLine) | project Timestamp, DeviceName, ProcessCommandLine, HISTFILESIZE_Value | pass | 2 | 12.19s | 0.0058 |
| gpt-35-turbo | 0 | DeviceProcessEvents | where ProcessCommandLine contains 'bash' | where ProcessCommandLine contains 'export HISTFILESIZE' | pass | 1 | 3.04s | 0.0053 |
| gpt-4-turbo-2024-04-09 | 0 | DeviceProcessEvents
| where FileName == 'bash' and ProcessCommandLine has 'export HISTFILESIZE'
| extend HISTFILESIZE_Value = tostring(extract('HISTFILESIZE=(\\d+)',1,ProcessCommandLine))
| project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, HISTFILESIZE_Value | pass | 3 | 21.97s | 0.1494 |
| gpt-4.1 | 0 | DeviceProcessEvents | where FileName =~ "bash" | where ProcessCommandLine has "export HISTFILESIZE=" | extend HISTFILESIZE_Value = extract(@'export HISTFILESIZE=([^\s;]+)', 1, ProcessCommandLine) | project TimeGenerated, DeviceName, AccountName, ProcessId, ProcessCommandLine, HISTFILESIZE_Value | pass | 1 | 4.37s | 0.0121 |
| gpt-4.1-finetuned | 0 | DeviceProcessEvents | where FolderPath endswith "bash" or ProcessCommandLine contains "/bash " | where ProcessCommandLine contains "export" and ProcessCommandLine contains "HISTFILESIZE=" | pass | 1 | 6.65s | 0.0227 |
| gpt-4.1-mini | 0 | DeviceProcessEvents | where FileName == "bash" // limit to bash processes | where ProcessCommandLine contains "export HISTFILESIZE=" // commands exporting HISTFILESIZE | extend HISTFILESIZE_Value = extract(@"export HISTFILESIZE=([^\s]+)", 1, ProcessCommandLine) // extract the assigned value | project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, HISTFILESIZE_Value | where isnotempty(HISTFILESIZE_Value) | pass | 1 | 4.06s | 0.0025 |
| gpt-4.1-nano | 0 | DeviceProcessEvents | where ProcessCommandLine contains 'bash' | where ProcessCommandLine matches regex @'(?i)export\s+HISTFILESIZE\s*=\s*[^\s]+' | extend HISTFILESIZE_Value=extract(@'HISTFILESIZE\s*=\s*([^\s]+)', 1, ProcessCommandLine) | project TimeGenerated, DeviceName, ProcessCommandLine, HISTFILESIZE_Value | where isnotempty(HISTFILESIZE_Value) | pass | 1 | 2.64s | 0.0006 |
| gpt-4o | 0 | DeviceProcessEvents
| where InitiatingProcessCommandLine has "export HISTFILESIZE="
| extend HISTFILESIZEValue = extract("HISTFILESIZE=(\\d+)", 1, InitiatingProcessCommandLine)
| project DeviceId, DeviceName, ProcessCommandLine, HISTFILESIZEValue | pass | 1 | 2.41s | 0.0157 |
| gpt-5-high | 0 | let LinuxDevices = DeviceInfo
| where OSPlatform =~ "Linux"
| distinct DeviceId;
DeviceProcessEvents
| where ActionType == "ProcessCreated"
| where DeviceId in (LinuxDevices)
| where FileName =~ "bash"
| where isnotempty(ProcessCommandLine)
| where ProcessCommandLine has "export" and ProcessCommandLine has "HISTFILESIZE"
// Extract HISTFILESIZE value (double-quoted, single-quoted, or bare)
| extend HIST_dq = extract(@'(?i)\bHISTFILESIZE\s*=\s*"([^"]+)"', 1, ProcessCommandLine),
HIST_sq = extract(@'(?i)\bHISTFILESIZE\s*=\s*''([^'']+)''', 1, ProcessCommandLine),
HIST_bare = extract(@'(?i)\bHISTFILESIZE\s*=\s*([^; \t]+)', 1, ProcessCommandLine)
| extend HISTFILESIZE_Value = coalesce(HIST_dq, HIST_sq, HIST_bare)
| where isnotempty(HISTFILESIZE_Value)
| project TimeGenerated, DeviceName, DeviceId, AccountName, ProcessId, FileName, ProcessCommandLine, HISTFILESIZE_Value
| order by TimeGenerated desc | pass | 5 | 355.38s | 0.1899 |
| gpt-5-mini-high | no answer | no query generated | fail | 5 | 0.00s | 0.0278 |
| gpt-5-mini-low | 0 | DeviceProcessEvents
| where ProcessCommandLine has "bash"
| where ProcessCommandLine has "HISTFILESIZE"
// extract the value assigned to HISTFILESIZE (case-insensitive), allowing optional quotes
| extend HISTFILESIZE = extract("(?i)HISTFILESIZE\\s*=\\s*['\\\"]?([^'\\\"\\s\\)]+)", 1, ProcessCommandLine)
| extend HISTFILESIZE = iff(isempty(HISTFILESIZE), "(not parsed)", tostring(HISTFILESIZE))
| project TimeGenerated, DeviceId, DeviceName, AccountName, ProcessId, FileName, ProcessCommandLine, HISTFILESIZE
| summarize arg_max(TimeGenerated, *) by DeviceId, ProcessId, ProcessCommandLine
| order by TimeGenerated desc | pass | 2 | 27.65s | 0.0076 |
| gpt-5-mini-medium | no answer | no query generated | fail | 5 | 0.00s | 0.0157 |
| gpt-5-nano-high | 0 | DeviceProcessEvents | where (InitiatingProcessFileName contains "bash" or ProcessCommandLine contains "bash" or InitiatingProcessCommandLine contains "bash") | where (InitiatingProcessCommandLine contains "export HISTFILESIZE=" or ProcessCommandLine contains "export HISTFILESIZE=") | extend HistFileSizeFromInitiatingExport = extract(@"export\s+HISTFILESIZE\s*=\s*(\d+)", 1, InitiatingProcessCommandLine) | extend HistFileSizeFromProcessExport = extract(@"export\s+HISTFILESIZE\s*=\s*(\d+)", 1, ProcessCommandLine) | extend HistFileSize = toint(coalesce(HistFileSizeFromInitiatingExport, HistFileSizeFromProcessExport)) | where isnotnull(HistFileSize) | project TimeGenerated, DeviceName, InitiatingProcessFileName, InitiatingProcessCommandLine, ProcessCommandLine, HistFileSize | order by TimeGenerated desc | pass | 3 | 70.37s | 0.0050 |
| gpt-5-nano-medium | no answer | no query generated | fail | 5 | 0.00s | 0.0077 |
| grok-3-beta | 0 | DeviceProcessEvents | where ProcessCommandLine has 'bash' | where ProcessCommandLine matches regex @'export\s+HISTFILESIZE=\d+' | extend HISTFILESIZE_Value = extract(@'HISTFILESIZE=(\d+)', 1, ProcessCommandLine) | project DeviceName, AccountName, ProcessCommandLine, HISTFILESIZE_Value, Timestamp | order by Timestamp desc | pass | 1 | 9.36s | 0.0224 |
| grok-3-mini-beta | 0 | DeviceProcessEvents
| where FileName contains "bash"
| where ProcessCommandLine contains "export HISTFILESIZE="
| extend HISTValue = extract("export HISTFILESIZE=([^ ]+)", 1, ProcessCommandLine)
| project TimeGenerated, DeviceName, ProcessCommandLine, HISTValue
| order by TimeGenerated desc | pass | 1 | 10.84s | 0.0017 |
| o1-high | 0 | DeviceProcessEvents | where FileName == "bash" | where ProcessCommandLine has "export HISTFILESIZE=" | extend HISTFILESIZEValue = extract(@"export\s+HISTFILESIZE=(?<histVal>\S+)", 1, ProcessCommandLine) | project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, HISTFILESIZEValue | pass | 1 | 27.80s | 0.2306 |
| o1-low | 0 | DeviceProcessEvents | where FileName =~ "bash" | where ProcessCommandLine contains "export HISTFILESIZE=" | parse kind=regex ProcessCommandLine with ".*export HISTFILESIZE=([^ ]+).*" histFileSize | project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, histFileSize | pass | 5 | 117.31s | 0.8059 |
| o3-high | 0 | // Locate bash commands that export HISTFILESIZE and capture the assigned value
DeviceProcessEvents
| where FileName in~ ("bash", "sh") or ProcessCommandLine has "/bin/bash"
| where ProcessCommandLine has "export" and ProcessCommandLine has "HISTFILESIZE="
// Pull the value that immediately follows the assignment (stops at the first whitespace or semicolon)
| extend HistFileSizeValue = extract(@"HISTFILESIZE\s*=\s*([^\s;]+)", 1, ProcessCommandLine)
| where isnotempty(HistFileSizeValue)
| project TimeGenerated, DeviceName, AccountName, FileName, ProcessCommandLine, HistFileSizeValue
| sort by TimeGenerated desc | pass | 1 | 38.17s | 0.0218 |
| o3-mini-high | 0 | DeviceProcessEvents | where FileName has "bash" and ProcessCommandLine contains "export HISTFILESIZE" | extend HistfileSize = extract(@"export\s+HISTFILESIZE[=\s]+(\S+)", 1, ProcessCommandLine) | project TimeGenerated, DeviceName, AccountName, FileName, ProcessCommandLine, HistfileSize | pass | 1 | 8.73s | 0.0081 |
| o3-mini-low | 0 | DeviceProcessEvents
| where FileName contains "bash"
| where ProcessCommandLine contains "export HISTFILESIZE="
| extend HISTFILESIZEValue = extract("export\\s+HISTFILESIZE=([^\\s]+)", 1, ProcessCommandLine)
| project TimeGenerated, ProcessCommandLine, HISTFILESIZEValue | pass | 2 | 16.30s | 0.0189 |
| o4-mini-high | 0 | DeviceProcessEvents | where FileName == "bash" | where ProcessCommandLine contains "HISTFILESIZE" | extend HistFileSize = extract(@"HISTFILESIZE\s*=\s*([^;\s]+)", 1, ProcessCommandLine) | where isnotempty(HistFileSize) | project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, HistFileSize | pass | 1 | 31.44s | 0.0097 |
| o4-mini-low | 0 | DeviceProcessEvents // Rely on the platform's time picker for the timerange | where FileName == "bash" or ProcessCommandLine has "bash" | where ProcessCommandLine has "export HISTFILESIZE" // Extract the HISTFILESIZE value using regex | extend HISTFILESIZE_Value = extract(@"HISTFILESIZE\s*=\s*([^; ]+)", 1, ProcessCommandLine) | project TimeGenerated, DeviceName, AccountName, ProcessId, ProcessCreationTime, ProcessCommandLine, HISTFILESIZE_Value | order by TimeGenerated desc | pass | 1 | 60.91s | 0.0098 |