linux-playground

1. du - implemented an advanced version of ls command for linux-like operating systems in c.

arguments:

• -k

  • Report the number of blocks each entry is allocated in the filesystem .

• -t [threshold]

  • Filter files based on a lower-bound threshold of > [threshold] bytes.

• [file | directory]

  • Run the command on a specific file, or on a different directory than where it was originally called.

• -r

  • Recursively follow all subdirectories, outputting entries for each of their files, and including an output line for each subdirectory total.

  USAGE: ./du -k -t <threashold_bytes> [file | directory]

2. shell - implemented shell in c

features:

• basic command execution like ls, grep etc.
• I/O redirection

  eg: ls > a.txt

• Pipes

  eg: cat words.txt | grep cat | sed s/cat/dog/ > doggerel.txt

3. Implemented nice system call, pseudo random number generator in xv6 (a linux like operating system for learning).

4. implemented mutex, spinlocks for thread safe global variable modification.

5. Implemented uniq system call.

6. run.c - read/write blockSize*blockCount bytes from/to a file, given a blockSize and blockCount and display read/write performance in MB/s.

USAGE: ./run <filename> [-r|-w] <block_size> <block_count>

7. run2.c find a fileSize that can be read in a fixed time interval for system performance analysis for various block sizes

USAGE: ./run2 <filename> <block_size>

8. fast.c - read a very large file in the fastest possible way, used optimal blockSize(system specific) and multithreading

USAGE: ./fast <filename>