E7. Write a simple shell script to display number of files/directories in the current working directory.

2.

Draw a picture with 9 little boxes and fill in the 1s and Os for the mode for a file with permission modes of rwxr-x-- X rw-r- - r - - rwxr-x - - X rw-rw - r - - rw-r- - r - -

Write a shell script that allows the user to enter six numbers, and sends it to a file. After which, the script will then display it on the screen. Hint: Make sure the script "cleans up" before running again.

Write code that when executed in PowerShell, will satisfy the following requirements: • Display the contents of the c:\windows\system32 directory. • Only display the file / directory names. • Pipe the result into the format list cmdlet • Use only one line to solve the problem.

äbäi 15 The following problems can be solved by writing commands in the command window, or by writing a program in a script file * .and then executing the file 22+5.12 1. 50-6.32 V412 –5.22 2. e5-100.53

You shall implement a Microshell, “MSH”.  MSH shall provide the following functions: Provide a shell-like interface for launching new programs: When MSH starts running, it will print a prompt "cssc0000% " (replace cssc0000 with your username) and then wait for the user to type in a file name. Note, MSH will NOT have any shell built-in functions (such as cd, setenv, printenv, bg, fg, etc), with the exception of #5 (below). When the user enters a filename and hits the “enter” key, MSH then reads the filename entered and determines if the file is an executable file. If it isn't, MSH will print a useful error message to the user and then return to #1 above (display a new prompt and wait for user input). If it is an executable file, then MSH will create a new process and run this program in the new process. Note – you will need to determine whether the filename is a fully qualified path name or if the file needs to be searched for (fully qualified pathnames begin with a slash (i.e. "/"),…

Can you please write C program that will act as a shell interface that should accept and execute a rm[ ] command in a separate process. There should be a parent process that will read the command and then the parent process will create a child process that will execute the command. The parent process should wait for the child process before continuing. This program should be written in C and executed in Linux.

find The find command takes a pattern as a command-line argument and recur- sively searches through directories to find a filename matching that pattern. It should print a relative path starting with "./" for every file/directory that matches. For example, running ./find 1s.c from within the hw2 directory should print ./1s.c. If run from the parent directory, the output would be . /hw2/1s.c. There may be multiple matches. If we run ./find .c from within the hw2 directory, we should see: ./find.c ./1s.c ./tree.c The output does not need to be sorted. If nothing matches, it shouldn't print anything. Pattern matching should be case sensitive.

Write a shell script that reads a directory name and displays all the files in this directory if it is a valid directory; otherwise keeps displaying a message like "Enter a valid directory" until the user enters a valid directory. Hints: you can use a while loop.