Write down a Unix command that will add the contents of a file named file1.txt and a file named file2.txt onto theend of a file named file3.txt.

Use the program cronttab to create cron jobs that: Append the output of the command uptime to a file in your home directory. This should run every 4 minutes. Appends the disk space used in /var to a different file in your home directory. Include the date and time in some way. This should run 8 times a day, evenly spaced throughout the day. You can choose the times. Make sure you are recording just the disk space used by /var, and not the disk space used by the entire partition that /var is on. Also, don't use human readable mode, since you will not be able to see any changes in the values if you do this. Runs a python program (which you have to write) that searches through the file created in step 1 and outputs any lines where the 5-minute load average first goes above 2.00 and then the next line where the 5-minute load average is back below 2.00. Save the results to a third file in your home directory. This program should run once a day between 3 and 5 am. (You should make sure that…

1. In an earlier assignment, you created a fileAsst directory containing several files. Give a command that will create a file named listing.dat, in your current (commandsAsst) directory, containing a list of the names of all the files in your fileAsst directory. The listing must not include dates, file sizes, or any information other than the names. 2. Someone has decided that the function sequentialInsert, declared in -cs252/Assignments/commandsAsst/project/arrayops.h, should be renamed orderedInsertion. Give a command to produce the altered version the header file, saving it as ~/UnixCourse/commandsAsst/arrayops.h (Something to think about: Why would the same approach not work well for changing the variable name i to i0?) 3. Sometimes programmers propose changes to an existing software definition and need to know what other code could be affected by the change. Suppose that you are a programmer who has proposed a change to the C/C++ data type known as "timespec". You know that there…

Answer the questions in Linux command 1. Create a single command to read a file called program.c and write a file called unreadable.c, by replacing all newlines and tabs with spaces, and replacing all multiple consecutive spaces with a single space. The result should still be a legal C program but not exactly readable. 2. Write a single shell command line, possibly consisting of multiple commands (separated by semicolons), that will create a file diffs.txt containing a list of all files found in my Documents directory that aren’t also found in yours. Assume your current working directory is your home directory.