Basic unix commands: minimal

This repository contains some unix commands that are implemented with system calls. This commands are minimal versions of the original commands.

cat:

This is a toy version of cat command. This works with read and write system calls.The program reads the file contents and outputs it to stdout.
cp:

This toy implementation of cp command copies file contents from one file to another.
ls and ls-r:

These are list and list recursive commands.ls-r uses a function walk_directory to list all the files under under a directory using the dirent header.
mkdir:

Simplest implementation of make directory command.
mv:

This is the same as unix mv command. This moves the contents of one file to another. This command can be used to rename a file. This implementation uses unlink system call to delete a name and possibly the file it refers to.
ps:

This is a toy version of unix process status command.
rm:

The rm command uses unlink system call to deete a name and possibly the file it refers to.
rmdir:

rmdir can use used to remove a empty directory
tee:

This is a simple unix tee command implementaion, this program reads standard input and writes to both output stream and a file.

Creates a file with with

  flags : O_RDWR | O_CREAT
  permissions: S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH

The usage of each command can be found out by passing "--help" as a command line argument.

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