->make command in the terminal creates the a.out executable file for running the shell -> main.c: . Shell implementation . Signal handler

-> headers.h: . All the headers required are inserted here it self

-> functions.h . All the global variables and functions are ideclared here

-> functions.c: . string tokeninizig function . cd , pinfo, echo implementations . setenv,unsetenv,jobs,kjob has been implemneted .fg and bg , overkill, quit

-> ls.c: . whole ls implementation has been done here

-> history.c: . History recording and history command implementation has been coded here

->History command implementation is acheived through creating a txt file where the executable file is running, it is modified every time when a command given to the terminal.

-> If & is given with builtin commands like(ls &, cd &, pid &,...), they have been assumed as foreground ....

->ctrl-z,ctrl-c has been handled by creating handlers

->last working directory is achieved through storing cwd after implentation of command.