P3 Tasks

Following are the features that need to be implemented:

• Parsing:
  • parse tokens
• Built Ins:
  • exit
  • cd using chdir
  • ls using scandir
    • directories should end with slash (not required)
    • sorting case insensitive
    • no .* files
    • alphasort using strcmp to avoid locale setting
  • local
    • getter and setter for local
    • update parse method to use getter
  • vars
  • export
    • getter and setter for environment variables
    • update parse method to use getter. Higher precedence
  • history
    • implement history using LL.
    • implement history set n.
    • implement history n. Don't record this.
    • only record non-built in commands.
• Non built ins:
  • use fork and execv to execute all other commands.
• File Redirection:
  • file redirection for built ins
  • file redirections for non built ins
• Script Mode:
• Batch Mode:
  • implement batch mode (file as an argument)
  • do not generate prompt in batch mode.
• Memory leak checks:
  • use valgrind to check for memory leaks
• Correct the exit condition and error codes.
• Miscellaneous cases:
  • when there $ on right side of assignment in commands other than echo, export
  • If the same command is executed more than once consecutively, it should only be stored in the history list once. (what if built-in/non built-in/same built-in?)
• Add README.md