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- 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.txtwhat is access modifier? Access modifier is good? why? We have Public, Default, Private, and Protected access modifiers do yo0u think which access modifier is better? why? Do we need all of them(access modifiers)? if you able to remove one of them which of them will you chose? why?
- 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”. Extend the shell that you created and add support for input/output redirection. So, thecommands in which |, < and > symbols are used should be supported by your shell in assignment 2.ls > file.txtman fork | grep child > file.txtThe command can have any number of | symbols, such ascommand1 | command 2 | command3 > file.txtThe Shell or Command Line Interpreter is the fundamental User interface to an Operating System. Your task is to write a simple shell - myshell - that has the following properties: Tasks: The shell must support the following internal commands: i. cd - Change the current default directory to . If the argument is not present, report the current directory. If the directory does not exist an appropriate error should be reported. This command should also change the PWD environment variable. ii. cls - Clear the screen. iii. dir - List the contents of directory page by page. iv. xcopy to - Copy the folder to . v. print - Display on the display followed by a new line (multiple spaces/tabs may be reduced to a single space). vi. md - Create the folder . vii. rd - Remove the folder if the folder is empty, should display error message if it is not. ix. quit - Quit the shell. x. The shell environment should contain shell=/myshell where /myshell is the full…In this question, you will develop your own version of shell. Your shell will execute commands given by the 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 character array 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”.
- The Shell or Command Line Interpreter is the fundamental User interface to an Operating System. write a simple shell - myshell - that has the following properties: Supported commands: The shell must support the following internal commands: cd- change the current default directory to. If theargument is not present, report the current directory. If the directory does not exist an appropriate error should be reported. This command should also change the PWD environment variable. clr - clear the screen. dir- list the contents of directory environ - list all the environment strings echo - display on the display followed by a new line (multiple spaces/tabs may be reduced to a single space) help - display the user manual using the more filter pause - pause operation of the shell until 'Enter' is pressed quit - quit the shell The shell environment should contain shell=/myshell where/myshell is the full path for the shell executable (not a hardwired path back to your directory, but the one…When the shell creates a new process to run a command, how does it know that the file is executable? If it's executable, how does it tell the difference between a shell script and a file formed by a compilation? What is the correct sequence for checking the above-mentioned situations?You can configure your shell by editing the file~/.bashrc for instance to change the value of$ PS1 and $PAth permenatrly true or false
- The Shell or Command Line Interpreter is the fundamental User interface to an Operating System. Your task is to write a simple shell - myshell - that has the following properties: Tasks: The shell must support the following internal commands: cd <directory> - Change the current default directory to <directory>. If the <directory> argument is not present, report the current directory. If the directory does not exist an appropriate error should be reported. This command should also change the PWD environment variable. cls - Clear the screen. iii. dir <directory> - List the contents of directory <directory> page by page. xcopy <source> to <destination> - Copy the <source> folder to <destination>. print <comment> - Display <comment> on the display followed by a new line (multiple spaces/tabs may be reduced to a single space). md <directory> - Create the folder <directory>. vii. rd…Write the command that will display all the files in the rpm package "vsftpd.x86_64". The commandMUST display the following information for each file:* permissions* owner* group* file size (regular files)* date* filename Assume that the rpm package resides in the /tmp directory, and that the /tmp directory is thecurrent directory.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