Write a shell script that performs the task of the below shell command. man ls | grep ls > file.txt
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Write a shell script that performs the task of the below shell command.
man ls | grep ls > file.txt
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Solved in 2 steps
- Part 2 Write a shell script that accepts two arguments. The first is a string, the second is a file name. The script searches the file for the string, then it displays one of these messages. 1. If the string is in the file, it should display "word does exist in file_name", where word is the string that is the first command line argument, and file_name is the name of the file given in the command line arguments 2. If the string is not in the file, it should display "word does not exist in file_name", where word is the string that is the first command line argument, and file_name is the name of the file given in the command line arguments 3. If the file does not exist, it should display "file_name does not exist" where file_name is as explained aboveShell scriptPlease write the program and explain-line-by-line. Thank you! A shell interface gives the user a prompt, after which the next command is entered. The example below illustrates the prompt osh> and the user's next command: cat prog.c. (This command displays the file prog.c on the terminal using the UNIX cat command.) osh>cat prog.c One technique for implementing a shell interface is to have the parent process first read what the user enters on the command line (in this case, cat prog.c) and then create a separate child process that performs the command. Unless otherwise specified, the parent process waits for the child to exit before continuing. This is similar in functionality to the new process creation illustrated in Figure 3.9. However, UNIX shells typically also allow the child process to run in the background, or concurrently. To accomplish this, we add an ampersand (&) at the end of the command. Thus, if we rewrite the above command as osh>cat prog.c & the…
- Write a Shell script that accepts a list of file names as arguments and counts and reports the occurrence of each word that is present in the first argument file in other argument files.Write a shell script that reads a file name and checks this file exists or not. If the file exists, searches this file for "Joshua" or "joshua" and displays the total number of occurrences of "Joshua" and "joshua"; if the file does not exists, display "the file does not exist." Hints: you can use cat and egrep.shell scripting- unix
- modify 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;}True or False???Below is a sequence of shell commands that we typed into a bash terminal window on a Linux machine and some of the output that was produced. Your job is to write the output produced by the commands in the sequence. The commands are executed consecutively and changes made by one command may affect the output produced by later commands. First Create a Directory and Rename as Name_AridNo like (Ali_18-Arid-102) and then execute the following commands and show output. Shell > pwd /home/me/test > ls -F hw1 hw1.bak tmp/ > bash > touch it > cd tmp > ls –F justme.txt > echo “Dear Ali” > diary > cat ‘Name_AridNo’ /etc/hosts > pwd
- 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.What are two ways you can execute a shell script when you do not have execute permission for the file containing the script? Can you execute a shell script if you do not have read permission for the file containing the script?In this question, you will develop your own version of shell. Your shell will execute commands given bythe user. The steps involved will be as follows:1. User types a command, such as “cp ./OS ../newOS”. The command will be stored in a characterarray or a string object.2. Shell will perform tokenization and separate the command and its arguments.3. Shell will create a child process and use execvp system call to execute the command.4. Shell will wait for the command to finish execution.5. After the command has been executed, shell will ask the user to enter the command again.6. Shell will exit when the command given by the user is “exit”. 7. The command can have any number of | symbols, such ascommand1 | command 2 | command3 > file.txt