shell常规操作

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* */2 * * * ntpdate cn.ntp.org.cn;clock -w

0 0 * * * find /data/tmp -mtime  +7 | xargs rm -rf

route add -net 192.168.100.0/24 gw 192.168.99.2

1\. Create a script file, such as /usr/local/bin/check_nginx.sh, with the following 
content: #!/bin/bash status=$(systemctl status nginx | grep Active | awk '{print $2}') if [ "$status" != "active" ]; then systemctl restart nginx fi 
2\. Add a cron job to execute the script every 30 minutes: */30 * * * * /usr/local/bin/check_nginx.sh

on the Linux host:# Set the system global umask to 002 echo "umask 002" >> /etc/profile

0 * * * * grep -rn "ERROR" /var/log/* > /var/log/error.log

1. Install nginx on the Linux host.
2. Create a configuration file for nginx, such as /etc/nginx/conf.d/proxy.conf.
3. Add the following content to the configuration file:
    server {
        listen 9000;
        location / {
            proxy_pass http://192.168.99.101:19200;
        }
    }
4. Restart nginx service.
5. Test the proxy configuration.

1. Create a script file, such as /usr/local/bin/backup_db.sh, with the following content:
    #!/bin/bash
    mysqldump -u username -p password test > /data/backup/test_$(date +%!Y(MISSING)%!m(MISSING)%!d(MISSING)).sql
2. Add a cron job to execute the script every night:
    0 0 * * * /usr/local/bin/backup_db.sh
3. Add a cron job to delete the backup 7 days ago:
    0 0 * * * find /data/backup/ -mtime +7 -type f -exec rm {} \;

1. Create a script file, such as /usr/local/bin/delete_tmp.sh, with the following content:
    #!/bin/bash
    find /data/tmp -mtime +7 -type f -exec rm {} \;
2. Add a cron job to execute the script every night at 0:00:
    0 0 * * * /usr/local/bin/delete_tmp.sh