Programming in C
Programming in C
4th Edition
ISBN: 9780321776419
Author: Stephen G. Kochan
Publisher: Addison-Wesley
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Chapter 12, Problem 2E

Locate the system header files < , < ,and < on your system (on Unix systems, look inside the / directory). Examine die files to see what’s in them.

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In UNIX, how would you remove the directory test and all files and subdirectories (recursively) in it? The directory test is located in (is a subdirectory of) /home/myid/smith/projects. O rmdir /home/myid/smith/projects/test O rmdir -r /home/myid/smith/projects/test rm -r /home/myid/smith/projects/test O rm -r projects/test
Implement a simple version of the linux cat command in C++. Use the system calls open(), get() and close().  cat - reads a file as specified by the user and prints its contents. A typical usage is as follows: If from my terminal y run ./cat main.cpp   the contents of main.cpp. will be printed. Your program cat can be invoked with one or more files on the command line; it should just print out each file in turn. Example:  [terminal]$ ./cat main.cpp main2.cpp #include <iostream>using namespace std;int main(){cout << "Hello, World!"; return 0;}#include <iostream>using namespace std;int main(){cout << "Programming is great fun!";return 0;} As you can see content of  main.cpp was printed first and the content of main2.cpp
Write the C or C++ program system2 that reads, when being executed, OS commands via the "command line parameter" C/C++ feature, and then executes them. The command line parameters must be legal Unix/Linux commands. Print the number of commands entered. To prepare, read about argc, argv, and envp. Focus is only argc and argv. A sample execution by fictitious user "mike" is: herb$ ./a.out pwd ls whoami argc 4 pwd argv[1] Executing command /Users/mikey 'pwd' = ls argv[2] Executing command 'ls' Applications Contacts Music Pictures familie herb Downloads testl Favorites Library Movies testl.c pix_low_2020 test2 test2.c Desktop Public Documents a.out test.c argv[3] = whoami Executing command mikey 'whoami'

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