Create the command file and put the command script into that file on the Magento root directory. Then execute that script using browser Url.

Upgrade command script

<?php
use MagentoFrameworkAppBootstrap;
 
require __DIR__ . '/app/bootstrap.php';
 
$params = $_SERVER;
 
$bootstrap = Bootstrap::create(BP, $params);
 
$obj = $bootstrap->getObjectManager();
 
$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');
$logger = $obj->get('PsrLogLoggerInterface');
try{
	$logger->info("upgrade start");
	echo passthru('php -d memory_limit=1G bin/magento setup:upgrade');
	$logger->info("upgrade finished");
}
catch(Exception $e){
	$logger->info("upgrade not working");
}
?>

di.comple command script

<?php
use MagentoFrameworkAppBootstrap;
 
require __DIR__ . '/app/bootstrap.php';
 
$params = $_SERVER;
 
$bootstrap = Bootstrap::create(BP, $params);
 
$obj = $bootstrap->getObjectManager();
 
$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');

$logger = $obj->get('PsrLogLoggerInterface');

try{
	$logger->info("compile start");
	echo passthru('php -d memory_limit=1G bin/magento setup:di:compile');
	$logger->info("compile finished");
}
catch(Exception $e){
	$logger->info("compile not working");
}
?>

Deploy command script

<?php
use MagentoFrameworkAppBootstrap;
 
require __DIR__ . '/app/bootstrap.php';
 
$params = $_SERVER;
 
$bootstrap = Bootstrap::create(BP, $params);
 
$obj = $bootstrap->getObjectManager();
 
$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');

$logger = $obj->get('PsrLogLoggerInterface');

try{
	$logger->info("compile start");
	echo passthru('php -d memory_limit=1G bin/magento setup:static-content:deploy');
	$logger->info("deploy finished");
}
catch(Exception $e){
	$logger->info("deploy not working");
}
?>

Indexer command script

<?php
use MagentoFrameworkAppBootstrap;
 
require __DIR__ . '/app/bootstrap.php';
 
$params = $_SERVER;
 
$bootstrap = Bootstrap::create(BP, $params);
 
$obj = $bootstrap->getObjectManager();
 
$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');

$logger = $obj->get('PsrLogLoggerInterface');

try{
	$logger->info("indexing start");
	echo passthru('php -d memory_limit=1G bin/magento indexer:reindex');
	$logger->info("indexing finished");
}
catch(Exception $e){
	$logger->info("indexing not working");
}
?>

Cache Flush command script

<?php
use MagentoFrameworkAppBootstrap;
 
require __DIR__ . '/app/bootstrap.php';
 
$params = $_SERVER;
 
$bootstrap = Bootstrap::create(BP, $params);
 
$obj = $bootstrap->getObjectManager();
 
$state = $obj->get('MagentoFrameworkAppState');
$state->setAreaCode('frontend');

$logger = $obj->get('PsrLogLoggerInterface');
try{
	$logger->info("cache start");
	echo passthru('php -d memory_limit=1G bin/magento cache:flush');
	$logger->info("cache finished");
}
catch(Exception $e){
	$logger->info("cache not working");
}
?>