Debian syslog contains repeating infomation like:
Dec 25 09:43:28 uvn-76-202 Eeva[7192]: at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Dec 25 09:43:28 uvn-76-202 Eeva[7192]: at Program.<>c.<<Main>b__3_6>d.MoveNext() in C:raamateevawebStoreProgram.cs:line 979
Dec 25 09:43:28 uvn-76-202 Eeva[7192]:
Dec 25 09:45:01 uvn-76-202 CRON[18528]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Dec 25 09:54:14 uvn-76-202 systemd[1]: Created slice User Slice of UID 0.
How to remove server name, process name, process id and spaces so that output is
Dec 25 09:43:28 at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Dec 25 09:43:28 at Program.<>c.<<Main>b__3_6>d.MoveNext() in C:raamateevawebStoreProgram.cs:line 979
Dec 25 09:45:01 (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
Dec 25 09:54:14 Created slice User Slice of UID 0.
Tried to use in ASP.NET 9 MVC controller
StribBuilder sb = new();
using StreamReader reader = new("/var/log/syslog");
string line;
while ((line = await reader.ReadLineAsync()) != null)
{
line = StrTran(line, "uvn-76-202 Eeva", "");
line = StrTran(line, " "), "");
sb.AppendLine(line);
}
static string StrTran(string cSearchIn, string cSearchFor, string cReplaceWith)
{
StringBuilder sb = new(cSearchIn);
return sb.Replace(cSearchFor, cReplaceWith).ToString();
}
but this removes only part of unnessecary information.
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
public class LogProcessor
{
public static async Task<string> ProcessLogAsync(string logPath)
{
StringBuilder sb = new();
using StreamReader reader = new(logPath);
string line;
while ((line = await reader.ReadLineAsync()) != null)
{
// Use regex to remove the server name, process name, and process
ID.
line = Regex.Replace(line, @"buvn-76-202b.*?[d+]:s*", "");
// Remove leading spaces (if any).
line = line.TrimStart();
sb.AppendLine(line);
}
return sb.ToString();
}
}
class Program
{
public static async Task Main(string[] args)
{
string logPath = "/var/log/syslog";
string processedLogs = await LogProcessor.ProcessLogAsync(logPath);
Console.WriteLine(processedLogs);
}
}