Give an example of a deadlock involving only a single process and a single resource.
What will be an ideal response?
A recursive process that acquires a lock on a resource. The process will acquire the lock, then execute a recursive call. When it tries to reacquire the lock, it will block. However, because it will be blocking on itself and has no way to release the lock once it has blocked, it will become deadlocked. Also, a process could wait on an event that will never occur because no provision has been made to signal the event.
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Create a JavaFX application with two buttons and two labels. Add an Image Icon of your choice to the first button and the first label.
This project uses a VBox layout and the same image used in the text chapter. A different image could be used for either the button or the label.
What is the purpose of a parameter query? What happens when a parameter query is executed?
What will be an ideal response?
Did the permissions change? What are the permissions of myFile.txt?
File Permissions Visualize and Change the File Permissions. a. Navigate to /home/analyst/lab.support.files/scripts/.
[analyst@secOps ~]$ cd lab.support.files/scripts/b. Use the ls -l command to display file permissions.
[analyst@secOps scripts]$ ls -l total 60 -rwxr-xr-x 1 analyst analyst 190 Jun 13 09:45 configure_as_dhcp.sh -rwxr-xr-x 1 analyst analyst 192 Jun 13 09:45 configure_as_static.sh -rwxr-xr-x 1 analyst analyst 3459 Jul 18 10:09 cyberops_extended_topo_no_fw.py -rwxr-xr-x 1 analyst analyst 4062 Jul 18 10:09 cyberops_extended_topo.py -rwxr-xr-x 1 analyst analyst 3669 Jul 18 10:10 cyberops_topo.py -rw-r--r-- 1 analyst analyst 2871 Apr 28 11:27 cyops.mn -rwxr-xr-x 1 analyst analyst 458 May 1 13:50 fw_rules -rwxr-xr-x 1 analyst analyst 70 Apr 28 11:27 mal_server_start.sh drwxr-xr-x 2 analyst analyst 4096 Jun 13 09:55 net_configuration_files -rwxr-xr-x 1 analyst analyst 65 Apr 28 11:27 reg_server_start.sh -rwxr-xr-x 1 analyst analyst 189 Dec 15 2016 start_ELK.sh -rwxr-xr-x 1 analyst analyst 85 Dec 22 2016 start_miniedit.sh -rwxr-xr-x 1 analyst analyst 76 Jun 22 11:38 start_pox.sh -rwxr-xr-x 1 analyst analyst 106 Jun 27 09:47 start_snort.sh -rwxr-xr-x 1 analyst analyst 61 May 4 11:45 start_tftpd.shc. The touch command is very simple and useful. It allows for the quick creation of an empty text file. Use the command below to create an empty file in the /mnt directory:
[analyst@secOps scripts]$ touch /mnt/myNewFile.txt touch: cannot touch '/mnt/myNewFile.txt': Permission denied
[analyst@secOps ~]$ ls -l /mnt total 4 drwxr-xr-x 2 root root 4096 Mar 3 11:13 second_drive
[analyst@secOps ~]$ ls -ld /mnt drwxr-xr-x 3 root root 4096 Mar 3 15:43 /mntd. The chmod command is used to change the permissions of a file or directory. As before, mount the /dev/sdb1 partition on the /home/analyst/second_drive directory created earlier in this lab:
[analyst@secOps scripts]$ sudo mount /dev/sdb1 ~/second_drive/e. Change to the second_drive directory and list the contents of it:
[analyst@secOps scripts]$ cd ~/second_drive [analyst@secOps second_drive]$ ls -l total 20 drwx------ 2 root root 16384 Mar 3 10:59 lost+found -rw-r--r-- 1 root root 183 Mar 3 15:42 myFile.txtf. Use the chmod command to change the permissions of myFile.txt.
[analyst@secOps second_drive]$ sudo chmod 665 myFile.txt [analyst@secOps second_drive]$ ls -l total 20 drwx------ 2 root root 16384 Mar 3 10:59 lost+found -rw-rw-r-x 1 root root 183 Mar 3 15:42 myFile.txt
Change the percent to a decimal. 
A. 
B. 
C. 
D. 
E. 