In linux code: Is [] bracketed expression used in shell scripts under /etc/init.d ? Write a cmd line to evaluate this. Another way to phrase the above question is below. Display all lines in all files in /etc/init.d which contains the pattern [] for test cmd
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In linux code:
Is [] bracketed expression used in shell scripts under /etc/init.d ? Write a cmd line to evaluate this.
Another way to phrase the above question is below.
Display all lines in all files in /etc/init.d which contains the pattern [] for test cmd
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- Use Linux executable objectCode5 for this question. These files are on syccuxas01.pcc.edu in directory ~michael.trigoboff/cs201/quiz02LinuxFiles. The file is run from the Linux command line, and takes one positive numerical argument, like this: ./objectcode5 3 (You can enter any small positive integer instead of 3.) Command line arguments are passed to int main(int argc, char** argv) as arguments argc and argv. You should assume that argc is at ebp+8 and argv is at ebp+12. This code contains a function named what. Using gdb, figure out what the function named what computes: 1) the absolute value of n 2) n squared 3) the sum of the integers from 1 through n 4) factorial of nmodify minishell.c to run who, ls, and date with option. who will show the count of users, ls will list files in long listing format and date will show UTC time. Modify this file so the shell can run commands with options.*/#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/wait.h>#include <stdlib.h>#include <fcntl.h> int main(int argc, char *argv[]){ char *cmd[] = {"who", "ls", "date"}; int i; while(1){ printf("0=who 1=ls 2=date : "); scanf( "%d", &i ); if(i<0 || i>2) continue; pid_t result= fork(); if(result==0) { /* child */ execlp( cmd[i], cmd[i], (char *)0 ); printf("execlp failed\n"); exit(1); } else if (result >0){ /* parent */ int status; wait(&status); } else{ //handle error } } return 0;}Write two c++ programs to implement a distributed version of a multithreaded Huffman decompressor using the one in project 1 The server program The user will execute this program using the following syntax: ./exec_filename port_no < input_filename where exec_filename is the name of your executable file, port_no is the port number to create the socket, and input_filename is the name of the file with the alphabet's information. The port number will be available to the server program as a command-line argument. The server program receives from STDIN the alphabet's information (using input redirection). The input file has multiple lines, where each line contains information (character and frequency) about a symbol from the alphabet. The input file format is as follows: A char representing the symbol. An integer representing the frequency of the symbol. Example Input File: E 3 G 3 F 1 H 2 Given the previous input file, the expected output for the server program is: Symbol: C,…
- Unix-based operating systems usually include a tool named tail. It displays the last 10 lines of a file whose name is provided as a command line argument. Write a Java program that provides the same behavior i.e. the user can specify how many lines to print from the terminal. Display an appropriate error message if the file requested by the user does not exist, or if the command line argument is omitted. Note: Make sure to display the last n lines of a file whose name is provided as a command line argument. You might need to pass a file as an argument, therefore make sure to have access to a sample file, the contents of which you want to print out.Write two c++ programs to implement a distributed version of a multithreaded Huffman decompressor using the one in project 1 The server program The user will execute this program using the following syntax: ./exec_filename port_no < input_filename where exec_filename is the name of your executable file, port_no is the port number to create the socket, and input_filename is the name of the file with the alphabet's information. The port number will be available to the server program as a command-line argument. The server program receives from STDIN the alphabet's information (using input redirection). The input file has multiple lines, where each line contains information (character and frequency) about a symbol from the alphabet. The input file format is as follows: A char representing the symbol. An integer representing the frequency of the symbol. Example Input File: E 3 G 3 F 1 H 2 Given the previous input file, the expected output for the server program is: Symbol: G,…In C++ Implement a simple version of the linux grep command in C++. grep - Looks through a file, line by line, trying to find a user-specified search term in the line. If a line has the word within it, the line is printed out, otherwise it is not. Use the system calls open(), getline(), close(). Requirements (examples run from. terminal) Your program grep is always passed a search term and zero or more files to grep through (thus, more than one is possible). It should go through each line and see if the search term is in it; if so, the line should be printed, and if not, the line should be skipped. [terminal]$ ./grep ! main.cpp main2.cppcout << "Hello, World!";cout << "Programming is great fun!"; The matching is case sensitive. Thus, if searching for world, lines with World will not match. Lines can be arbitrarily long (that is, you may see many many characters before you encounter a newline character, \n). grep should work as expected even with very long lines. For…
- We will use the file classlist.txt. Note that it contains a list of usernames. 3. Write a script called finduser that is to be called as follows, where classlist is the name of the classlist file, and username is a particular student's username, either first name or last time. ./finduser classlist username The script should check that the correct number of arguments was received and print an error message if not, check whether the classlist file exists and print an error message if not, print the line of the given username in the classlist file If you have not been doing so all along, you should now add some comments to your script and thoroughly test it! 4. Write the script into your lab report.#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> int main(){ int stdout_bak = dup(STDOUT_FILENO); // make a backup of stdout system("rm -f mystery.txt"); // remove file using a shell command int out_fd = open("mystery.txt", // open file mystery.txt O_WRONLY|O_CREAT, // for writing, create if needed S_IRUSR|S_IWUSR); // give user read/write permission if(out_fd == -1){ // check for errors opening file perror("Couldn't open file 'mystery.txt'"); exit(1); // bail out if open fails } printf("1. Now you see me.\n"); // print to the screen dup2(out_fd, STDOUT_FILENO); // change stdout to go to mystery.txt printf("2. Now you don't!\n"); // print goes to mystery.txt close(out_fd); // close mystery.txt dup2(stdout_bak, STDOUT_FILENO); // restore stdout to screen…Hello! I am trying to write a program in Pynthon. Need help. Requirements: Write a .py file like KevFiles.py (I used Spyder to do this).In that .py, create a function that strips the first letters from all file names in a directory. If the new name is a duplicate of an existing name, Python will throw an exception. Handle that exception by adding “dup” a number as part of the files new name.Call that function from a Jupyter Notebook, passing in the number of characters to delete and the file path. Thank you!
- Write a Python program that writes user input to a CSV file, reads the data back from the CSV file, and incorporates exception handling. You will perform the following steps: Prompt the user to enter their name, age, and email address. If the user does not enter a valid age (i.e., a positive integer), your program should catch this error and ask for the input again. Open a new file in write mode named user_info.csv and write the user's information to this file in CSV format. Make sure you handle exceptions if you do not have write permissions for the file or other IO errors occur. Now open the user_info.csv file in read mode. Make sure your code handles any exceptions if the file is not found or other IO errors occur. Read the content of the file and store it in a variable. Print the contents of this variable to the console/shell. Provide comments in your code to explain the logic used.Implement a simple version of the linux grep command in C++. grep - Looks through a file, line by line, trying to find a user-specified search term in the line. If a line has the word within it, the line is printed out, otherwise it is not. Use the system calls open(), getline(), close(). Requirements (examples run from. terminal) Your program grep is always passed a search term and zero or more files to grep through (thus, more than one is possible). It should go through each line and see if the search term is in it; if so, the line should be printed, and if not, the line should be skipped. [terminal]$ ./grep ! main.cpp main2.cppcout << "Hello, World!";cout << "Programming is great fun!"; The matching is case sensitive. Thus, if searching for world, lines with World will not match. Lines can be arbitrarily long (that is, you may see many many characters before you encounter a newline character, \n). grep should work as expected even with very long lines. For this,…Please read. It's Java. Write a client program and server program. The server uses a socket connection to allow a client to supply a filename and the server will send the file contents to the client or an error message if the file does not exist. The client will create a new file with the same contents. The client will supply the filename "input.txt" to the server and create as it's output "output.txt". Don't ask the user for these names. The Server sends whatever file the Client requests. Don't put "input.txt" in the Server. The client must get the contents from the Server. It must not read input.txt directly. Do not accept arguments from the command line. One class named Server and one named Client. These must be the ONLY 2 CLASSES