Hello!Im trying to build a command line interpreter simulator us.pdf
0 likes9 views
The document discusses a user's attempt to build a command line interpreter simulator in C for Linux, specifically seeking help to execute the 'help' command programmatically. The user successfully demonstrates executing the 'ls' command using the system function but encounters a problem with 'help' because it is not found in the expected directories. The document suggests using the path '/bin/ls' and provides an update for additional functionality to list directories.
1 of 1
Download to read offline
Hello!Im trying to build a command line interpreter simulator us.pdf
- 1. Hello! I'm trying to build a command line interpreter simulator using C programming language, working in the linux environment. I don't want to get in to designing the whole thing, I just want a little help with a particular problem. This particular problem is how do I write a line or lines in C that will run a command as if I had typed it in the terminal? More specifically, the command I'm trying to run is "help." The command that shows all available commands. So for example, I want to simulate the "ls" command, the command that lists the content of the current directory. I would go into my editor and type this: #include #include int main() { system("ls"); return 0; } Now if I go into the terminal, compile that program and run it, it'll display the content of the current directory as would simply typing in "ls" in the terminal. The problem is, I can't manage to do the same for the "help" command. After researching a bit, I've found that the sh shell is looking in /bin and /usr/bin to execute "help." However, that command is in neither directory and will ultimately let me know that the command is "not found." If it's not in the earlier mentioned directories, then where could it be? Is it even possible to run "help" within a C program? Sorry if it's a little long, I just wanted to be as clear as I can be. Any help would be greatly appreciated! Solution you need to us , system ("/bin/ls"); Below is the update ******************************************************* Also , you can use the below program to list the directories,