diff --git a/cli/commandupdate.cpp b/cli/commandupdate.cpp
index 910fb46..c12c213 100644
--- a/cli/commandupdate.cpp
+++ b/cli/commandupdate.cpp
@@ -1,5 +1,109 @@
+#include <QCommandLineParser>
+#include <QFileInfo>
+#include <QDateTime>
+#include <QThreadPool>
+#include <QtConcurrentRun>
 #include "commandupdate.h"
+#include "logger.h"
 
 int CommandUpdate::handle(QStringList arguments)
 {
+	QCommandLineParser parser;
+	parser.addOptions(
+		{{{"v", "verbose"}, "Print path of the files while updating them"},
+		 {{"n", "dry-run"}, "Only print which files would be updated, don't actually update them"},
+		 {"pattern", "Only consider to update files in the index matching the pattern, e. g. */.git/*.", "pattern"},
+		 {{"d", "delete"}, "If a file does not exist anymore, delete it"},
+		 {{"c", "continue"}, "Continue adding files, don't exit on first error"},
+		 {{"a", "all"}, "On error, no files should be updated, even already processed ones"},
+		 {{"t", "threads"}, "Number of threads to use.", "threads"}
+
+		});
+
+	parser.addHelpOption();
+	parser.addPositionalArgument("update", "Checks files for changes and updates them", "update");
+
+	parser.process(arguments);
+	bool keepGoing = parser.isSet("continue");
+	bool verbose = parser.isSet("verbose");
+	bool deleteMissing = parser.isSet("delete");
+	bool dryRun = parser.isSet("dry-run");
+	QString pattern = parser.value("pattern");
+
+	if(parser.isSet("all"))
+	{
+		throw QSSGeneralException("To be implemented");
+	}
+	if(parser.isSet("threads"))
+	{
+		QString threadsCount = parser.value("threads");
+		QThreadPool::globalInstance()->setMaxThreadCount(threadsCount.toInt());
+	}
+	FileSaver saver(*this->dbService);
+	QVector<FileData> files;
+	int offset = 0;
+	int limit = 1000;
+	int processedRows = dbService->getFiles(files, pattern, offset, limit);
+
+	while(processedRows > 0)
+	{
+		QVector<QString> filePathsToUpdate;
+		for(FileData &fileData : files)
+		{
+			QFileInfo fileInfo(fileData.absPath);
+			if(fileInfo.exists() && fileInfo.isFile())
+			{
+				if(fileInfo.lastModified().toSecsSinceEpoch() != fileData.mtime)
+				{
+					if(!dryRun)
+					{
+						filePathsToUpdate.append(fileData.absPath);
+					}
+					else
+					{
+						Logger::info() << "Would update" << fileData.absPath << endl;
+					}
+				}
+			}
+			else
+			{
+				if(deleteMissing)
+				{
+					if(!dryRun)
+					{
+						if(!this->dbService->deleteFile(fileData.absPath))
+						{
+							Logger::error() << "Error: Failed to delete" << fileData.absPath << "from databas" << endl;
+							if(!keepGoing)
+							{
+								return 1;
+							}
+						}
+						if(verbose)
+						{
+							Logger::info() << "Deleted" << fileData.absPath << endl;
+						}
+					}
+					else
+					{
+
+						Logger::info() << "Would delete" << fileData.absPath << endl;
+					}
+				}
+			}
+		}
+
+		if(!saver.updateFiles(filePathsToUpdate, keepGoing, verbose))
+		{
+			if(!keepGoing)
+			{
+				Logger::error() << "Failed to update all files selected for updating" << endl;
+				return 1;
+			}
+		}
+		offset += limit;
+		processedRows = this->dbService->getFiles(files, pattern, offset, limit);
+	}
+
+	return 0;
 }
diff --git a/cli/commandupdate.h b/cli/commandupdate.h
index b6231bd..730b9e4 100644
--- a/cli/commandupdate.h
+++ b/cli/commandupdate.h
@@ -1,12 +1,11 @@
 #ifndef COMMANDUPDATE_H
 #define COMMANDUPDATE_H
 #include "command.h"
-
+#include "filesaver.h"
 class CommandUpdate : public Command
 {
   public:
-	CommandUpdate();
-
+	using Command::Command;
 	int handle(QStringList arguments) override;
 };