Rhel7 - process management

One . Set up root User's planned tasks

1. Every day in the morning 7:50 Auto on sshd service ,22 spot 50 Turn off
   

2. every other 5 Once a day FTP Server public directory /var/ftp/pub
   

3. Every Saturday 7:30 when , Restart httpd service
   

4. Every Monday 、 3、 ... and 、 Five 17:30 when , Pack and go backup /etc/httpd Catalog
   

5. Every night 9：30 restart linux System , And delete /var/www/user1 All files under
   

6. Automatic shutdown at 5:30 p.m. from Monday to Friday .
   

Two . Set up natasha User's planned tasks ：

1. Every Sunday night 23:55 When will “/etc/passwd” Copy the contents of the file to the user's home directory , Save as pwd.txt file
   

3、 ... and . Separate use ps,kill and top command , Realize its operation ：

1. Identify the processes that use the most memory , Put it nice The priority is adjusted to 15
   

2. determine cpu Most used processes , Terminate the process
   

Four . Suspend and resume process

1. Press Ctrl+z key , Suspend process cat
   

2. Input jobs command , View operation
   

3. Input bg, hold cat Switch to background execution
   

4. Input fg, hold cat Switch to the foreground to execute
   

5. Press Ctrl+c key , The end of the process cat
   

5、 ... and . Use at command

1. Register a one-time run command ps –aux The homework , Make it 3:00am perform .
   

2. Register a planned task and broadcast it at 9:00 on March 8th women's day to congratulate everyone on a happy holiday .
   

3. Register a scheduled task 6 Find... In hours /root All extensions in the directory are .txt The file of .
   prohibit harry Users perform scheduled tasks , Other users are not restricted .