Linux-Shell-Interpreter

Created a mini Linux shell interpreter in C.

• This page contains the list of all valid commands that can be executed using this shell.

• This shell can implement a total of 11 commands: 6 internal commands/shell builtins, and 5 external commands as listed here -

Internal commands/ Shell builtins

• chd [relative_path] (cd) (no flags)
• hisstory [-clear, -write] (history)
  • Flags handled -
    • -clear: to clear the command history.
    • -write: to write something from stdin into the history.
• cwd (pwd) (no flags)
• hellp (help) (no flags)
• ecko [-n, -e] ["..."] (echo)
  • Flags handled -
    • -n: to omit the newline character ('\n') after echoing.
    • -e: to identify some escape sequences which it otherwise would have treated as any other characters (\t and \n handled).
• quit (exit) (no flags)

External commands

• datetime [-g, -u] (date)

  • Flags handled -
    • -g: to display GMT date, day and time.
    • -u: to display UTC date, day and time.

• makedir [-v, -m] [dir_name] (mkdir)

  • Flags handled -
    • -v: verbose - prints a message after creating the directory.
    • -m: mode - takes a 4 digit mode as input to custom specify read, write and execute permissions for the newly created directory.

• list [-a, -l] (ls)

  • Flags handled -
    • -a: to display all files in the current working directory, including the hidden files.
    • -l: to display all files in long listing format (excluding hidden ones).

• kat [>] [file1, file2, ...] [>] [file1, file2, ...] (cat) (no flags)

• remove [-v, -d] [file_name, dir_name] (rm)

  • Flags handled -
    • -v: verbose - prints a message after removing the file passed as argument.
    • -d: to remove directory