/C-Shell-fmlsh

Interactive shell in C

Primary LanguageC

FML Shell

Sriteja Reddy Pashya | 2021111019

Requirements

  • GCC compiler
  • Linux OS (preferably Ubuntu)

Running Shell

From the root directory of project, run make followed by ./fmlsh

File & Functions

  • main.c

    • Run Shell Loop
    • Executes respective function based on arguments from command

  • command.c

    • Takes input from user
    • Separates input into commands separated by ; and &, and arguments separated by whitespace

  • prompt.c

    • Print prompts

  • cd.c

    • Navigates to a given directory

  • pwd.c

    • Prints the working directory

  • echo.c

    • Prints user input after removing excess whitespace

  • discover.c

    • executes the discover command,
    • Assumes that all file names are enclosed in ""

  • history.c

    • Prints history of commands stored in .fmlsh_history
    • Doesn't store consecutive commands with the same arguments when extra whitespace is removed

  • .fmlsh_history

    • stores all the commands

  • ls.c

    • Executes the ls command

  • pinfo.c

    • Executes the pinfo command

  • runner.c

    • Executes the processes by forking into a child process

  • headers.h

    • Contains all necessary headers

Other Implementations

  • exit to exit the shell.
  • fml easter egg.

Assumptions

  • Reasonable assumptions are made for things like length of current path, number of commands, command length, etc. The shell will work perfectly for all "day to day work".

  • echo will treat everything as normal character.

  • File and directory names shouldn't contain spaces or special characters.

  • Any error while running a command will result in aborting the command after printing an error message.

  • I/O redirection operators <, >, >> and pipes | must have whitespace before and after them.