linux常用命令

01 linux常用命令

• rpm -qa | grep 查看是否安装应用
  rpm -e 删除应用
  rpm -e –nodeps 强力删除

02 Ubuntu PHP升级和切换到PHP8.1

引用文章：https://cloudcone.com/docs/article/how-to-install-php-8-1-on-ubuntu-20-04-22-04/

sudo apt update   
php -v
sudo apt install ca-certificates apt-transport-https software-properties-common
sudo add-apt-repository ppa:ondrej/php
sudo grep -rhE ^deb /etc/apt/sources.list* | grep -i ondrej
sudo apt update
sudo apt install php8.1 -y
php -v

增加文件info.php， sudo nano  /var/www/html/info.php

<?php
phpinfo();
?>

sudo systemctl restart apache2

sudo apt install php8.1-
sudo apt install php8.1-{gd,zip,mysql,oauth,yaml,fpm,mbstring,memcache,mysqli,curl,dom,imagick,intl}
php --modules

从PHP7.2 切换到PHP8.1。参考：https://www.gxlsystem.com/PHPjiqiao-2338844.html

sudo a2enmod php8.1
sudo a2dismod php7.2
sudo update-alternatives --set php /usr/bin/php8.1
sudo update-alternatives --set phar /usr/bin/phar8.1
sudo systemctl restart apache2

03 内存过高的处理方式

找到内存占用高的前5，杀死进程，如VestaCP 中的clamav

ps aux | head -1;ps aux |grep -v PID |sort -rn -k +4 | head -5
systemctl stop clamav-daemon