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OSN Assignment 2

OSN Assignment 2 made by Prakhar Jain (2022121008)

Instructions to Run

  • Inside 2022121008_Assignment2 folder , run make and then ,./shell to start the shell

Prompt

  • the shell starts with the prompt <USERNAME@HOSTNAME: CURRENT_WORKING_DIRECTORY>

Builtin Commands

  • cd - changes the directoy . cd acommand also supports '.', '..', '-', '~' . works on both relative and absolute path

  • pwd - prints the current working directory

  • echo - prints the strings as it is after handling tabs and spaces

  • ls - lists all the information of a file or files inside a directory also suppports -a (prints hidden files) flag and -l (prints information in long format) flag

  • exit or quit - these commands will kill the terminal

Proesses

All other commands are treated as system commands

  • background - commands ending with '&' are treated as background processes. After exiting the process name along with the pid is printed with status normally or abnormally.

  • foreground - all other commands are treated as foreground commands. The time interval for which the command executes is also printed.

pinfo

  • syntax - pinfo <pid> pid is optional

  • If nothing is given as argument information about all child processes is given.

  • If pid is given as argument then the information about the given process is printed.

discover

  • Discover command searches for a file or a directory.

  • -d - searches for all the directories.

  • -f - Searches for all the files.

history

  • History command prints the last 10 commands entered in the shell.