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Create a crontab to perform the tasks listed below at the frequencies specified. Note that you do NOT need to write the actual scripts!
a) Run a backup script named local-backup from the /usr/local/adm directory every weekday at 11:30pm.
b) Execute a cleanup script named weekly-cleanly from the same directory above, every Friday at 4:30am.
c) Every night, produce a list of files that are world-writable.
d) Execute a reporting program, named twice-monthly from the /usr/local/bin directory on the 15th and 31st.
e) Execute a performance report script named perf23 every hour at 15 and 45 minutes after the hour on weekdays between the hours of 6:00am and 6:00pm. The script is located in root's home directory.
A computer has a cache, main memory, and a disk. If a referenced word is in the cache, 20 ns are required to access it. If it is in main memory but not in the cache (called cache miss)
Given a cache access time of 20ns, a main memory access time of 1000ns, and a cache hit ratio of 90 percent. Assuming fetches to main memory are started in parallel with look-ups in cache
How deep can the procedure calls go before registers must be saved in memory? (That is, what is the maximum number of "active" procedure calls that can be made before we need to save any registers in memory?)
simulating the cpu scheduling for a computer architecture with 64k of memory and 3 io devices. simulate the long-term
Remembering that there's a trade-off between memory use. Then give an example where doing so will cause throughput to suffer.
Write an echo server using socket programming in UNIX using C programming - Write the contents of the buffer back to the client.
When a process creates a new process using the fork command, which of the subsequent is shared between the parent process and the child process?
When purchasing your latest cell phone, how much research did you do before you decided to purchase a particular phone? You probably reviewed major features or you may have even gone to great depth. Features are possible with operating systems sof..
If the user enters -999 as the first account number, the program should simply exit, and display an appropriate message of your choice.
Given a window size of 6 and assuming the primary memory is initially unloaded, what is the working-set size under the given reference stream after the entire stream has been processed?
In this assignment you will implement a distributed system facility based on Client-Server programming - The client and server processes will be on different machines. In this case, the server is a stateful server.
For each of the following parameter-passing methods, what are the values of the list array after execution?
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